Environment terminology · MLC-0121

Environment terms: A (2,484)

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• A' electrodeOne of the current-emitting electrodes of a resistivity-logging system (A); the current return electrode is...
• A Horizon1. The top layer of soil. Plant and other organic debris builds up in this layer. This is the part of the...
• A Scale Sound LevelA measurement of sound approximating the sensitivity of the human ear, used to note the intensity or...
• A to B TestingTesting performed in pairs to allow comparison of vehicle A to vehicle B.
• A ZoneAreas inundated in a 100-year storm event that experience conditions of less severity than conditions...
• A1B Emissions ScenarioA medium emissions scenario in which greenhouse gas emissions increase, with reductions in the rate of...
• A2 Emissions ScenarioA high emissions scenario assuming continued increases in greenhouse gas emissions.
• AbandonedFor purposes of defining a material as a solid waste under RCRA Subtitle C, a material that is disposed of...
• Abandoned ChildA child or adolescent who is deserted by parents or parent substitutes without regard for its future care.
• Abandoned Hardrock MineApplies to non-coal mining environments where environmental hazards such as acid-mine drainage, heavy metal...
• Abandoned, Inactive, or Uncontrolled Hazardous Waste SitesHazardous waste facilities identified through the U.S. EPA CERCLIS Database as abandoned, inactive or...
• Abandoned Industrial SiteSite that cannot be used for any purpose, being contaminated by pollutants, not necessarily radioactive...
• Abandoned MineMine where mining operations have occurred in the past and(1) The applicable reclamation bond or financial...
• Abandoned Mine LandAbandoned mine land is the land, waters, and surrounding watersheds contaminated or scarred by the...
• Abandoned PropertyProperty that can be presumed to be deserted, or an intent to relinquish possession or control can be...
• Abandoned Well1. A well that is no longer being used or cannot be used because of its poor condition.
• Abasic Site FormationAbasic Site Formation involves the creation of an apurinic or apyrimidinic site resulting from the loss of a...
• AbatementReducing the degree or intensity of, or eliminating, pollution.
• Abatement CostCosts borne by firms when they are required to remove and/or reduce environmental byproducts created during...
• Abatement costsCosts borne by firms when they are required to remove and/or reduce environmental byproducts created during...
• Abatement Debris1. Refers to waste resulting from remediation activities. (U.S. EPA, 1994d)
• Abatement SystemDevice or equipment that destroys or removes fluorinated GHGs and N2O in waste streams from one or more...
• Abatement System CategoryCategory of abatement systems grouped by manufacturer model number(s) and by the gas that the system abates...
• AbbreviationA shorthand set of 10 or 16 characters used to uniquely identify a control measure. Each control measure used...
• ABC Transporter BindingABC Transporter Binding involves temporary non-covalent interaction of a molecule through intermolecular...
• AbdomenThat portion of the body that lies between the thorax and the pelvis.
• Abdominal Cavity1. The portion of the body that lies between the thorax and the pelvis.
• Abdominal WallThe tissues that surround the organs that are present within the abdominal cavity. The abdominal wall tissue...
• Abductive InferenceInference from data to the hypothesis that best accounts for the data. Compare to inductive inference and...
• Abiotic1. Non-living.
• Abiotic Component1. The part of the ecosystem that is not a product of a life process
• Abiotic CyclePertaining to the nonliving system.
• Abiotic factorsPertaining to any non-biological factor or influence, such as geological or meteorological characteristics.
• Abiotic StressNegative effects on plants from their environment, such as drought, excessive heat, frost, and others.
• AblationOccurs when more glacier ice is lost by melting and evaporation each year than is added by snowfall.
• Ablative CoatingCoating that chars when exposed to open flame or extreme temperatures, as would occur during the failure of...
• Abnormal FlowAbnormal flow (hydrologic alteration) refers to changes in river or stream volume caused by removing water...
• Abnormal Plant DevelopmentAbnormal development, which is characterized by the change in the morphology of anatomical structures.
• Abnormal Spinal Cord DevelopmentSpina bifida
• Abnormally Treated VehicleAny diesel light-duty vehicle or diesel light-duty truck that is operated for less than five miles in a 30...
• About EPAInformation about the agency itself. Including, but not limited to, information about its leadership, its...
• Above Ground Storage TankAny tank or other container that is aboveground, partially buried, bunkered, or in a subterranean vault. This...
• Above Ground TankDevice meeting the definition of “tank” in § 260.10 and that is situated in such a way that the entire...
• Aboveground BiomassThe total amount of organic matter present in tree and plant structures located above ground in given area.
• Aboveground Release1. Any release to the surface of the land or to surface water. This includes, but is not limited to, releases...
• Aboveground Storage FacilityTank or other container, the bottom of which is on a plane not more than 6 inches below the surrounding...
• Aboveground Storage TankAny tank or other container that is aboveground, partially buried, bunkered, or in a subterranean vault. This...
• Aboveground TankTank used to store or process used oil that is not an underground storage tank as defined in § 280.12 of this...
• AbrasionThe wearing away of a solid surface by friction.
• Abrasive BlastingRemoving surface film from a part by using abrasive directed at high velocity against the part. Abrasive...
• Abrasive CleanersProducts that clean through abrasive or scouring action.
• Abrasive Jet MachiningRemoving stock material from a part by a high-speed stream of abrasive particles carried by a liquid or gas...
• Abrupt Climate Change1. Sudden (on the order of decades), large changes in some major component of the climate system, with rapid...
• Abscisic AcidAbscission-accelerating plant growth substance isolated from young cotton fruit, leaves of sycamore, birch...
• AbscissionShedding by a plant of its parts, such as leaves, flowers, fruits, or seeds. The process is regulated by the...
• Absolute DeviationThe response associated with the BMR will be the background estimate plus or minus the BMR.
• Absolute Mean Sea Level ChangeAn eustatic change in mean sea level relative to a conventional terrestrial coordinate system with the origin...
• Absolute Pressure1. Absolute pressure refers to the total pressure exerted on a surface. The more usual pressure measured by...
• absolute risk1. The probability of injury, disease, or death under specific circumstances. In quantitative terms, risk is...
• Absolute TemperatureTemperature scale that starts with zero at absolute zero temperature.
• absolute viscosityA measure of a fluid's resistance to tangential or shear stress. Also referred to as dynamic viscosity; see...
• Absolutely Stable AirAn atmospheric condition that exists when the environmental lapse rate is less than the moist adiabatic lapse...
• Absolutely Unstable AirAn atmospheric condition that exists when the environmental lapse rate is greater than the dry adiabatic...
• Absorbed Dose1. The amount of a substance penetrating the exchange boundaries of an organism after contact. Absorbed dose...
• Absorbent1. Material that extracts one or more substances from a fluid (gas or liquid) medium on contact, and which...
• Absorbent Circulation PumpPump commonly powered by natural gas pressure that circulates the absorbent liquid between the absorbent...
• AbsorberIn a photovoltaic device, the material that readily absorbs photons to generate charge carriers (free...
• Absorption1. The penetration of atoms, ions, or molecules into the bulk mass of a substance.
• Absorption Barrier1. Any of the exchange sites of the body that permit uptake of various substances at different rates (e.g...
• Absorption ChillerA type of air cooling device that uses absorption cooling to cool interior spaces.
• Absorption Cooling DeviceUses solar thermal energy to vaporize the refrigerant.
• Absorption EfficiencyA measure of the proportion of a substance that a living organism absorbs across exchange boundaries (e.g...
• Absorption FactorThe fraction of a chemical making contact with an organism that is absorbed by the organism.
• Absorption KineticsRate at which the physical or physiological processes by which substances, tissue, cells, etc. take up or...
• Absorption of radiationThe uptake of radiation by a solid body, liquid or gas. The absorbed energy may be transferred or re-emitted.
• Absorption SpectroscopyMethod of chemical analysis in which elements are identified by their dark absorption lines seen in the...
• Absorptive FeederAn animal, such as a parasitic tapeworm, that absorbs digested food products through the body wall.
• Absorptive MediaRemoval of pollutants via absorption to media, not elsewhere classified.
• Abstract1. An abstract can be viewed as a miniature version of the paper. The scientific abstract provides a brief...
• Abstract & Indexing Database1. An A&I - or Abstract and Indexing - database provides bibliographic citations and abstracts of the...
• Abstraction LayerThe abstraction layer consists of the software deployed across the physical layer, which manifests the...
• Abundance indexInformation obtained from samples or observations that is used to measure the weight or number of fish that...
• Abyssal Deep CirculationDeep, slow circulation in the abyssal zone driven by horizontal differences in density of water masses. The...
• Abyssal FanA low, outspread, relatively flat-to-gently sloping mass of loose material - shaped like an open fan or a...
• Abyssal PlainA flat region of the deep ocean floor (with a slope less than 1:1,000) that was formed by the deposition of...
• AC1Test procedure as described in §86.162-00 which simulates testing with air conditioning operating in an...
• AC2Test procedure as described in §86.162-00 which simulates testing with air conditioning operating in an...
• Academic DisciplineThe broad categories of academic endeavor or disciplines. For example, chemistry, biochemistry, neurology...
• AcaricideAn agent that destroys mites
• Acceleration Test ProcedureMeasurement methodologies specified in Appendix I.
• AcceptableThis designation means that a substitute may be used, without restriction, to replace the relevant ODS within...
• Acceptable Daily Intake1. The amount of a chemical a person can be exposed to on a daily basis over an extended period of time...
• Acceptable EndpointFor the purpose of wildlife criteria derivation, acceptable subchronic and chronic endpoints are those which...
• Acceptable Indoor Air QualityAir in which there are no known contaminants at harmful concentrations as determined by cognizant authorities...
• Acceptable KnowledgeAny information about the process used to generate waste, material inputs to the process, and the time period...
• Acceptable Quality Level1. Maximum percentage of failing vehicles that for purposes of sampling inspection, can be considered...
• Acceptable Risk1. The likelihood of suffering disease or injury that will be tolerated by an individual, group, or society...
• Acceptable Subject to Narrowed Use LimitsThis designation indicates means that a substitute would be unacceptable unless its use was restricted to...
• Acceptable Subject to Use ConditionsThis designation means that a substitute would be unacceptable unless it is used under certain conditions. An...
• Acceptance CriteriaAddress the adequacy of existing information proposed for inclusion into the project. These criteria often...
• Acceptance DateDate on which EPA enters the application into the data system.
• Acceptance SpecificationAcceptance criteria set at the onset of a quality assurance plan that help to determine if the intended...
• Acceptance TestingCertain contractually required testing may be needed before the new model or the client accepts model...
• Accepted ApplicationApplication that has been entered into the data system.
• AcceptorA dopant material, such as boron, which has fewer outer shell electrons than required in an otherwise...
• ACCESS1. The availability of, or the permission to consult, records.
• Access ChargeA fee charged subscribers or other telephone companies by a local exchange carrier for the use of its local...
• access, lateralThe right to walk or otherwise move along a shoreline, once someone has reached the shore.
• access, perpendicularA legally permissible means of reaching the shore from dry land.
• access point1. A place where anyone may legally gain access to the shore; usually a park, the end of a public street, or...
• Access roadA temporary or permanent road over which timber is transported from a loading site to a public road. Also...
• Access to Semi-Structured & Unstructured DataActivities to provide database administration and management services for storage of agency semi-structured...
• Access to Structured DataActivities to provide database administration and management services for warehousing of Agency critical...
• AccessibilityThe extent to which the structural and organizational arrangements facilitate participation in the program.
• AccessibleCompliant with the official Section 508 standards.
• Accessible Asbestos-Containing MaterialWhen referring to ACM means that the material is subject to disturbance by school building occupants or...
• Accessible Environment1. The atmosphere; (2) land surfaces; (3) surface waters; (4) oceans; and (5) all of the lithosphere that is...
• ACCESSION1. The transfer of the legal and physical custody of permanent records from an agency to the National...
• Accession NumberAn identification number that used to be assigned (for cataloging purposes) to volumes of studies submitted...
• Accessory PigmentA photosynthetic pigment which absorbs light and transfers energy to chlorophylls during photosynthesis.
• Accessory Respiratory OrganIn fishes, a superficial or internal organ which complements the gills in respiration when the fish is in...
• Accident1. An unexpected event that happens by chance and is not expected in the normal course of events.
• Accident Potential MinimizationDesign chemicals and their physical forms (solid, liquid, or gas) to minimize the potential for chemical...
• Accident SiteThe location of an unexpected occurrence, failure or loss, either at a plant or along a transportation route...
• Accidental Contamination EventThe unplanned, unintentional, introduction into water, air, and soil of microorganisms, chemicals, toxic...
• Accidental DisasterAn unpremeditated, unplanned, unexpected occurrence inflicting widespread destruction and distress and having...
• Accidental EmissionAn unintended environmental release.
• Accidental ExposureUnintentional contact with a substance by swallowing, breathing, or touching the skin or eyes
• Accidental OccurrenceAccident, including continuous or repeated exposure to conditions, which results in bodily injury or property...
• Accidental Release1. Unanticipated emission of a regulated substance or other extremely hazardous substance into the ambient...
• Acclimation1. Response by an animal that enables it to tolerate a change in a single factor (e.g. temperature) in its...
• Acclimatization1. The physiological and behavioral adjustments of an organism to changes in its environment.
• Account Number1. Identification number given by the Administrator to each Allowance Tracking System account pursuant to §...
• AccountabilityThe responsibility of program staff to provide evidence to stakeholders and sponsors that a program is...
• ACCOUNTABLE OFFICERS' ACCOUNTSSpecified records accumulated by collecting, disbursing, and certifying officers and required by the General...
• Accounting1. Accounting entails accounting for assets, liabilities, fund balances, revenues and expenses associated...
• Accreditation1. Third party attestation related to a conformity assessment body conveying a formal demonstration of its...
• Accreditation BodyOrganization that provides an impartial verification of the competency of conformity assessment bodies or...
• Accreditation Body Assessment1. Process to include an on-site review undertaken by an AB to assess the competence of all operations of a...
• Accreditation Body Reassessment1. Assessment, as described in sections 7.5 to 7.11 of ISO/IEC 17011:2004(E) (incorporated by reference, see...
• Accredited LaboratoryWhen referring to a person or laboratory means that such person or laboratory is accredited in accordance...
• Accredited PersonWhen referring to a person or laboratory means that such person or laboratory is accredited in accordance...
• accretion1. Records adding to, or extending, a series or system of permanent records previously accessioned by the...
• Accretion (Atmosphere)The growth of a precipitation particle by the collision of a frozen particle with a supercooled liquid water...
• ACCRUED EXPENDITURESThe charges incurred by the recipient during a given period requiring the provision of funds for: goods and...
• ACCRUED INCOMEThe sum of: earnings during a given period from services performed by the recipient and goods and other...
• Accumulated SpeculativelyStorage of a material in lieu of expeditious recycling. Materials are usually accumulated speculatively if...
• Accumulated Speculatively Material“Accumulated speculatively” if it is accumulated before being recycled. A material is not accumulated...
• Accumulation ModelA model that measures changes in materials over time.
• AccumulatorA component of a heat pump that stores liquid and keeps it from flooding the compressor. The accumulator...
• Accuracy1. Closeness of a measured or computed value to its "true" value, where the "true" value is obtained with...
• Accuracy and PrecisionSum of accuracy and repeatability, as defined in 40 CFR 1065.1001. For example, if a measurement device is...
• Accurate1. The degree of agreement between a measured value and the true value. Accuracy is usually expressed as...
• Acellular OrganismDescribes the construction of an organism or tissue that is a mass of protoplasm which is not divided into...
• Acellular VaccineVaccine containing partial cellular material as opposed to complete cells.
• AcequiaA gravity-driven waterway, similar in concept to a flume. Most are simple ditches with dirt banks, but they...
• AcetaldehydeA colorless, flammable liquid used in the manufacture of acetic acid, perfumes, and flavors. It is also an...
• AcetaminophenAnalgesic antipyretic derivative of acetanilide. It has weak anti-inflammatory properties and is used as a...
• Acetic Acid1. Product of the oxidation of ethanol and of the destructive distillation of wood. It is used locally...
• Acetic Acid BacteriaBacteria that change alcohol into acetic acid
• AcetoneCAS 67-64-1 Acetone is a manufactured chemical that is also found naturally in the environment. It is a...
• AcetylationA chemical reaction in which a small molecule called an acetyl group is added to other molecules. Acetylation...
• Acetylcholine1. A neurotransmitter. Acetylcholine in vertebrates is the major transmitter at neuromuscular junctions...
• Acetylcholine Metabolism(Metabolism of) a chemical made by some types of nerve cells. It is used to send messages to other cells...
• Acetylcholine ReceptorCell surface proteins that bind acetylcholine with high affinity and trigger intracellular changes...
• Acetylcholinesterase1. An enzyme that catalyzes the hydrolysis of acetylcholine to choline and acetate. In the CNS, this enzyme...
• AcetyleneAn acetylene molecule is composed of two carbon atoms and two hydrogen atoms. The two carbon atoms are held...
• Acetyl-Polymalonyl PathwayChemical pathway for the majority of lichens.
• Achievable Potential1. The subset of technical potential that can realistically be achieved, taking into account real-world...
• Achieve Final ComplianceConnect and operate the collection and control system as specified in the final control plan. Within 180 days...
• Achlorophyllous PlantParasitic plants that have no chlorophyll.
• Acid1. A corrosive solution with a pH less than 7. Vinegar is a common weak acid; battery acid is much stronger.
• Acid Aerosol1. Acidic liquid or solid particles small enough to become airborne. High concentrations can irritate the...
• Acid CleaningIn industrial processes, often used to remove inorganic deposits from the workpiece.
• Acid Condensate Storage TankAny storage tank containing cooking acid following the sulfur dioxide gas fortification process.
• Acid CopolymerAcid copolymers are the copolymers of ethylene and acrylic acid,
• Acid Deposition1. Combination of wet deposits from the atmosphere, consisting of droplets of sulfuric acid and nitric acid...
• Acid Gas1. Gas stream of hydrogen sulfide (H2S) and carbon dioxide (CO2) that has been separated from sour natural...
• Acid Gas Removal UnitProcess unit that separates hydrogen sulfide and/or carbon dioxide from sour natural gas using liquid or...
• Acid Gas Removal Vent Emission1. Acid gas separated from the acid gas absorbing medium (e.g., an amine solution) and released with methane...
• Acid Gas Scrubbing SystemWet scrubbing system capable of achieving high acid gas removal efficiency by introducing water, caustic, or...
• Acid HydrolysisThe treatment of cellulosic, starch, or hemicellulosic materials using acid solutions (usually mineral acids)...
• Acid Mine Drainage1. Drainage of water from areas that have been mined for coal of other mineral ores. The water has a low pH...
• Acid Mine Drainage Control(Control of) drainage of water from areas that have been mined for coal of other mineral ores; the water has...
• Acid MistSulfuric acid mist, as measured by Method 8 of appendix A to this part or an equivalent or alternative method.
• acid neutralizing capacity1. A measure of the ability for water or soil to neutralize added acids. This is done by the reaction of...
• Acid Pickling NeutralizationUsing a dilute alkaline solution to raise the pH of acid pickling rinse water that remains on the part after...
• Acid PrecipitationPrecipitation, such as rain, snow or sleet, containing relatively high concentrations of acid-forming...
• Acid Rain1. Acid rain is a term used to describe several ways that acidic compounds fall out of the atmosphere...
• Acid Rain Compliance OptionOne of the methods of compliance used by an affected unit under the Acid Rain Program as described in a...
• Acid Rain Compliance PlanFor the purposes of the Acid Rain Program, means the document submitted for an affected source in accordance...
• Acid Rain Emissions Limitation1. For purposes of sulfur dioxide emissions:(i) The tonnage equivalent of the allowances authorized to be...
• Acid Rain Emissions ReductionA requirement under the Acid Rain Program to reduce the emissions of sulfur dioxide or nitrogen oxides from a...
• Acid Rain Emissions Reduction RequirementRequirement under the Acid Rain Program to reduce the emissions of sulfur dioxide or nitrogen oxides from a...
• Acid Rain PermitThe legally binding written document or portion of such document, including any permit revisions, that is...
• Acid Rain Program1. A national sulfur dioxide and nitrogen oxides air pollution control and emissions reduction program...
• Acid RecoverySulfuric acid pickling operations that include processes for recovering the unreacted acid from spent...
• Acid RegenerationHydrochloric acid pickling operations that include processes for regenerating acid from spent pickling acid...
• Acid RinsePart of the equipment cleaning process for stainless steel and rubber parts, removes fat, protein and...
• Acid solutionAny water solution that has more hydrogen ions (H+) than hydroxide ions (OH-); any water solution with a pH...
• Acid TreatmentGeneral term used to describe any application of an acid solution to a metal surface. Acid cleaning, chemical...
• Acid Treatment with ChromiumGeneral term used to describe any application of an acid solution containing chromium to a metal surface...
• Acid Treatment without ChromiumGeneral term used to describe any application of an acid solution not containing chromium to a metal surface...
• Acid-Base Property1. In aqueous solutions, the ability of the substance to enter into neutralization reactions yielding a salt...
• Acid-Base ReactionCan be defined in a variety of ways. In aqueous solutions, it is generally defined as a reaction where a...
• Acidic1. (uh-SID-ick) The condition of water or soil which contains a sufficient amount of acid substances to lower...
• Acidic Amino AcidsAmino acids with side chains that are negatively charged at physiological pH.
• Acidic PollutantsHarmful particles, such as sulfur dioxide and nitrogen oxides, that turn into acid when they mix with water...
• Acidic Substance1. Substance that either can donate a proton or accept an electron pair in chemical reactions
• acidificationRefers to reducing something's pH, making it more acidic; also means the loss of ANC.
• Acidified(uh-SID-uh-FIE-d) The addition of an acid (usually nitric or sulfuric) to a sample to lower the pH below 2.0...
• Acidity1. The ability of a substance to lose a hydrogen ion or to accept an electron pair in a reaction.
• AcidogenesisBacterial conversion of simple compounds into substrates for methanogenesis (acetate, formate, hydrogen...
• AcidosisPathologic condition resulting from accumulation of acid in, or loss of base from, the blood or body tissues
• Acid-Rock DrainageWhen rocks containing sulfide minerals are exposed to air, their oxidation forms sulfuric acid in the water...
• AcidsA corrosive solution with a pH less than 7. (TOE)
• Acids and Acid Salts1. Any of various typically water-soluble and sour compounds that in solution are capable of reacting with a...
• AcknowledgmentAs defined in § 3.3 of CROMERR, a confirmation of electronic document receipt.
• Acknowledgment of ConsentNotice sent by EPA to an exporter of hazardous waste, indicating that the importing country has agreed to...
• AcneformResembling acne
• AcoelomateAn animal that does not have a true coelom or body cavity, i.e., a body cavity between the outer wall and the...
• Acoustic DescriptorNumeric, symbolic, or narrative information describing a product's acoustic properties as they are determined...
• Acoustic impedanceReflects the ability of a boundary to reflect seismic energy. It is the contrast of density multiplied by...
• Acoustic logAlso called sonic log; a record of changes in the character of sound waves as they are transmitted through...
• Acoustic televiewer logA record of the amplitude of high-frequency acoustic pulses reflected by the borehole wall; provides location...
• Acoustic wave1. A sound wave transmitted through material by elastic deformation.
• Acquire & Manage FacilitiesManage the acquisition of facilities, including design, layout, construction, lease and ownership agreements.
• Acquire & Manage Fleets & EquipmentActivities to acquire and manage agency vehicle fleets and non-IT equipment, including selection, lease or...
• Acquire PersonnelActivities to select best qualified individual(s), make official offer of employment and confirm acceptance...
• acquired immunityA form of cellular defense which identifies certain foreign substances (antigens) as harmful to the body. For...
• Acquired Immunodeficiency Syndrome1. A syndrome resulting from the acquired deficiency of cellular immunity caused by the human...
• Acquired LandLands in federal ownership which were obtained by the government through purchase, condemnation, of gift, of...
• acquired landsLands in federal ownership which were obtained by the government through purchase, condemnation, of gift, of...
• AcquisitionAcquiring by contract with appropriated funds of supplies or services (including construction) by and for the...
• ACQUISITION COST OF EQUIPMENTThe net invoice unit price of the equipment, including the cost of modifications, attachments, accessories...
• Acquisition DateThe date on which a person acquires title to the property.
• Acquisition Sensitive InformationIncludes contract information that must be protected from public disclosure or from anyone who does not...
• Acquisition ServicesProvides technical support for obtaining hardware and software required to implement EPA's information...
• Acquisitions"Acquisition" means the acquiring by contract with appropriated funds of supplies or services (including...
• AcreThe unit of measure most typically used to describe land area in the United States. An acre is equivalent to...
• Acre-FootA volume of water that covers one acre to a depth of one foot, or 43,560 cubic feet (12335 cubic meters).
• Acre-InchA volume measurement typically associated with irrigation operations on cropland. An acre-inch is equivalent...
• Acres Cleaned UpThis acreage is calculated from cleanup activities conducted or leveraged by the EPA grant. For assessment...
• Acres of Green Space CreatedThe number of acres that have been newly created or made available as green space (i.e., acres of green space...
• Acrylic and Modacrylic Fibers ProductionProduction of either of the following synthetic fibers composed of acrylonitrile units: acrylic fiber or...
• Acrylic FiberManufactured synthetic fiber in which the fiber-forming substance is any long-chain synthetic polymer...
• Acrylonitrile Butadiene Styrene Latex ResinABS produced through an emulsion process; however, the product is not coagulated or dried as typically occurs...
• Acrylonitrile Butadiene Styrene ResinStyrenic terpolymers consisting primarily of acrylonitrile, 1,3-butadiene, and styrene monomer units. ABS is...
• Acrylonitrile Solution PolymerizationProcess where acrylonitrile and comonomers are dissolved in a solvent to form a polymer solution (typically...
• Acrylonitrile Styrene Acrylate ResinResin formed using acrylic ester-based elastomers to impact-modify styrene acrylonitrile resin matrices.
• Acrylonitrile Suspension PolymerizationPolymerization process where small drops of acrylonitrile and comonomers are suspended in water in the...
• Act1. The Public Health Service Act.
• Act of GodA sudden and violent act of nature that could not have been foreseen or prevented (e.g., flood, earthquake).
• Act or "the act"The Federal Water Pollution Control Act, also known as the Clean Water Act (CWA), as amended, Title 33 of the...
• ActinA contractile protein found in muscle cells. Together with myosin, actin provides the mechanism for muscle...
• Actinolite1. Mineral in the amphibole group. It is generally not used commercially, but is a common impurity in...
• actinomycetesAny of numerous, generally filamentous, and often pathogenic, microorganisms resembling both bacteria and...
• Action AgencyDenotes the Agency that is establishing/issuing an Action (i.e. State, EPA, or Tribe).
• ACTION COPYThe copy of a document sent to the agency, office, or individual responsible for taking action. See also COPY...
• Action ID (Name)Unique Identifier for the Action that will be used to track the Action entered (such as the corresponding...
• Action Level1. The level of lead or copper which, if exceeded in over 10% of the homes tested, triggers treatment or...
• Action Level (regulatory)The concentration of lead or copper in water specified in §141.80(c) which determines, in some cases, the...
• Action Levels1. Regulatory levels recommended by EPA for enforcement by FDA and USDA when pesticide residues occur in food...
• Action PacketIn reference to the IAQ Tools for Schools Action Kit (http://www.epa.gov/iaq/schools/actionkit.html) -...
• Action Potential1. Abrupt changes in the membrane potential that sweep along the cell membrane of excitable cells in response...
• Action TypeIdentifies the type of Action (TMDL, 4B, Alternative, Protection Plan, etc.).
• Activated Alumina SorptionUses a porous, granular, aluminum media to adsorb ions from solution. Activated alumina media can either be...
• Activated Carbon1. Adsorptive particles or granules of carbon usually obtained by heating carbon (such as wood). these...
• Activated Carbon FiltrationA material used to filter harmful chemicals from contaminated water and air. It is composed of black granules...
• Activated Carbon Injection SystemAdd-on air pollution control system in which activated carbon or brominated activated carbon is injected into...
• Activated CharcoalA highly absorbent form of carbon used to remove odors and toxic substances from liquids or gases.
• Activated Sludge1. Product that results when primary effluent is mixed with bacteria-laden sludge and then agitated and...
• activated sludge processA sewage treatment process by which bacteria that feed on organic wastes are continuously circulated and put...
• Activation logAlso called neutron-activation logs; a record of radiation from radionuclides that are produced in the...
• ActivatorA chemical added to a pesticide to increase its activity.
• Active Attack1. An actual assault perpetrated by an intentional threat source that attempts to alter a system, its...
• Active Collection SystemGas collection system that uses gas mover equipment. [40 CFR 60.751 (CFR 2013)]
• Active Electric UtilityAny facility subject to the requirements of this subpart that is in operation on October 19, 2015. An...
• Active FaultA fault that is likely to have another earthquake sometime in the future. Faults are commonly considered to...
• Active Fraction Organic MatterThe highly dynamic or labile portion of soil organic matter that is readily available to soil organisms. May...
• active immunity1. An organisms resistance to disease or infection, developed because the organisms immune system has...
• Active Ingredient1. The chemical or substance component of a pesticide product that can kill, repel, attract, mitigate or...
• Active Ingredient Associated ImpurityAny impurity present in the technical grade of active ingredient; and any impurity which forms in the...
• Active Ingredient Technical GradeMaterial containing an active ingredient:(1) Which contains no inert ingredient, other than one used for...
• Active Institutional ControlControlling access to a disposal site by any means other than passive institutional controls; (2) performing...
• Active LandfillLandfill in which solid waste is being placed or a landfill that is planned to accept waste in the future...
• Active MarginContinental margin located where the edges of lithospheric plates are colliding, resulting in tectonic...
• Active MeasureRisk management measures or engineering controls that rely on mechanical, or other energy input to detect and...
• Active Mining Area1. Place where work or other activity related to the extraction, removal, or recovery of metal ore is being...
• Active MitigationEquipment, devices, or technologies that need human, mechanical, or other energy input to function. 40 CFR...
• Active Monitoring AreaArea that will be monitored over a specific time interval from the first year of the period (n) to the last...
• Active Pharmaceutical IngredientAny component that provides pharmacological activity or other direct effect in the diagnosis, cure...
• Active PortionPortion of a facility where treatment, storage, or disposal operations are being or have been conducted after...
• Active PowerThe component of electric power that performs work, typically measured in kilowatts (kW) or megawatts(MW)...
• Active Public Health SurveillanceSurveillance in which the health agency solicits reports.
• Active radon/radon decay product measurement deviceA radon or radon decay product measurement system which uses a sampling device, detector, and measurement...
• Active RangeMilitary range that is currently in service and is being regularly used for range activities.
• Active RetarderDevice or system for decelerating rolling rail cars and controlling the degree of deceleration on a car by...
• Active SatelliteA functioning satellite that receives and transmits or retransmits radio-communication signals to or from a...
• Active Server Page1. An ASP (Active Server Page) is an HTML page that includes one or more scripts (small embedded programs)...
• Active Service DrainDrain is receiving refinery wastewater from a process unit that will continuously maintain a water seal.
• Active Sewage Sludge UnitSewage sludge unit that has not closed.
• Active SiteActive CERCLIS sites are sites at which site assessment, removal, remedial, enforcement, cost recovery, or...
• Active SitesActive CERCLIS sites are sites at which site assessment, removal, remedial, enforcement, cost recovery, or...
• Active solar heatingMechanical or electrical systems that collect and absorb solar radiation, then transfer the solar heat to the...
• Active System1. Passive system with the addition of a fan to more actively draw radon from the soil into the stack where...
• Active TransportAn energy-expending mechanism by which a cell moves a chemical across the cell membrane from a point of lower...
• Active Transporter InteractionActive Transporter Interaction involves temporary non-covalent binding of a molecule through intermolecular...
• Active Uranium MineUnderground uranium mine which is being ventilated to allow workers to enter the mine for any purpose.
• Active Use Sulfur Dioxide ControlSO2 constant control system installed at a smelter before August 7, 1977 and not totally removed from regular...
• Active Waste Facility Portion1. That part of a facility or unit that has received or is receiving wastes and that has not been closed in...
• active/rest cycles (alternating drainfields)Final treatment and soil-based dispersal component of a decentralized treatment system that is composed of...
• ActivitiesThings you do-activities you plan to conduct in your program.
• ActivityA quantifiable action or function used to calculate emissions for a process. Replaces the narrower term...
• Activity indexA ratio of current year to prior year values, but it is used when a variable other than production is the...
• Activity Pattern Data1. Information on human activities used in exposure assessments. These may include a description of the...
• Activity pattern (time use) dataInformation on activities in which various individuals engage, length of time spent performing various...
• Activity PlansWritten procedures in a school's asbestos-management plan that detail the steps a Local Education Agency...
• Activity, Product, or ServiceBroadly covers all the possibilities for an organization to have an influence on the environment, both...
• Activity (radiochemistry)Rate of nuclear decay occurring in a body of material, equal to the number of nuclear disintegrations per...
• Activity RatioA ratio of current year to prior year values that is reported when a chemical is involved in an activity not...
• Activity-Based Sampling1. Empiric approach in which airborne concentrations of asbestos are measured during an event where the...
• Actual Construction StartIn general, initiation of physical on-site construction activities on an emissions unit which are of a...
• Actual Contamination for a Drinking Water IntakeDrinking water intake located in a portion of a surface water body that meets the criteria for an observed...
• Actual Contamination for the Surface Water PathwayA portion of a surface water body is considered subject to actual contamination if it meets criteria for an...
• Actual Contamination in the Air Migration PathwayA target population is subject to actual contamination if a sample location within its distance category...
• Actual Contamination in the Ground Water PathwayA drinking water well is subject to actual contamination if a sample from the well meets the criteria for an...
• Actual Emission CreditEmission credits based on actual applicable production/sales volume as contained in the end-of-year reports...
• Actual Emission Rate1. Emissions of a pollutant from an affected source determined by taking into account actual emission rates...
• Actual Gas ConsumptionQuantity of gas used during wafer/substrate processing over some period based on a measured change in gas...
• Actual Hazardous Air Pollutant EmissionHAP emitted to the atmosphere from either uncontrolled or controlled emission points.
• Actual Peak Capacity105% of the maximum annual volume of renewable fuels produced from a specific renewable fuel production...
• actual risk1. The damage to life, health, property, and/or the environment that may occur as a result of exposure to a...
• Actual Solvent LossGallons of solvent lost from a source during 12 operating months as determined in accordance with § 63.2853.
• Actual Sulfur Dioxide Emissions RateAnnual average sulfur dioxide emissions rate for the unit (expressed in lb/mmBtu), for the specified calendar...
• Actual Weighted Average Nitrogen Oxides Emission RateFor a NOX averaging plan under § 76.11 of this chapter and for a year:(1) The sum of the products of the...
• Acute1. Used to describe disease where symptoms are readily evident. Treatment is generally required.
• Acute Effect1. An adverse effect on any living organism in which severe symptoms develop rapidly and often subside after...
• Acute Exposure1. Contact with a substance that occurs once or for only a short time (up to 14 days) [compare with chronic...
• acute exposure limitsA variety of short-term exposure limits to hazardous substances, designed to be protective of human health...
• Acute Hazardous WasteHazardous wastes that meet the listing criteria in §261.11(a)(2) and therefore are either listed in §261.31...
• acute health effect1. An immediate (i.e., within hours or days) adverse health effect that may result from exposure to certain...
• Acute Health HazardImmediate toxic effects
• Acute Inhalation StudyShort-term toxicity test characterized by a single exposure by inhalation over a short period of time (at...
• Acute PoliomyelitisAn acute infectious disorder that affects the nervous system. It is caused by the poliovirus. The virus...
• Acute Radiation SyndromeThe effects on a whole organism from large doses of ionizing radiation over a short amount of time. Human...
• Acute Reference ConcentrationAn estimate (with uncertainty spanning perhaps an order of magnitude) of a continuous inhalation exposure for...
• Acute Reference DoseAn estimate (with uncertainty spanning perhaps an order of magnitude) of a daily oral exposure for an acute...
• Acute Respiratory FailureLife-threatening respiratory failure that develops rapidly. Causes include injury, sepsis, drug overdose, and...
• Acute ResponseThe response of (effect on) an organisms which has a rapid onset. A commonly measured rapid-onset response in...
• Acute TestsA toxicity test of short duration, typically 4 days or less (i.e., of short duration relative to the lifespan...
• Acute Toxicity1. The ability of a substance to cause severe biological harm or death soon after a single exposure or dose...
• Acute Toxicity Assay(Analysis for) any poisonous effect produced within a short period of time following an exposure, usually 24...
• Acutely Toxic EffectA chemical substance produces acutely toxic effects if it kills within a short time period (usually 14...
• AcyltransferaseClass of enzymes that catalyze the transfer of acyl groups, most commonly a carboxylic acyl group forming...
• Ad Hoc NetworkA wireless network that dynamically connects wireless client devices to each other without the use of an...
• Ad Valorem TaxTax based upon the value of real property.
• Adaptation1. Adjustments made by animals in respect of their environments. The adjustments may occur by natural...
• Adaptation PlanPlans that identify actions to avoid, benefit from, or deal with current and future climate change...
• Adaptation ScienceIntegrated scientific research that directly contributes to enabling adjustments in natural or human systems...
• Adaptive CapacityThe ability of a system to adjust to climate change (including climate variability and extremes) to moderate...
• Adaptive Decision ProcessProcedure for decision making in which results are improved by monitoring current circumstances and modifying...
• Adaptive ImmunityProtection from an infectious disease agent that is mediated by B- and T- lymphocytes following exposure to...
• Adaptive implementationA process that allows for the evaluation of the adequacy of the TMDL in achieving the water quality standard...
• Adaptive Management1. Approach where source controls are initiated while additional monitoring data are collected to provide a...
• Adaptive Management MethodType of project management method where a facility chooses an approach to meeting the project goal, monitors...
• Adaptive ResponseAppropriate reaction to the environment
• Adaptive sampling strategy1. A sampling strategy that allows modification of sampling design and analysis to adapt to changing...
• Added Food IngredientPrepared sauces (prepared from items such as dairy products, starches, sugar, tomato sauce and concentrate...
• Added Risk1. The difference between the cancer incidence under the exposure condition and the background incidence in...
• Addendum to the State's EPA-Approved Hazardous Waste Management ProgramA supplementary document to the EPA binder containing the text of the authorized version of each state...
• AddictionUncontrollable craving, seeking, and use of a substance such as a drug or alcohol.
• Addition ReactionMonomers are added to the polymeric chain without the formation of a separate molecule. An initiator starts...
• Additional Advance AuctionAuction of advance allowances that were offered the previous year for sale in an advance sale.
• Additional DemographicsDemographic information is available to add to the EJScreen map under the "Additional Demographics" button...
• Additional InsuredAn individual or entity that is not automatically included as an insured under the policy of another, but for...
• Additional Risk1. The calculated difference in risk of a particular condition between those who are exposed and those who...
• Additional Use1. A request to add another use or new use on the label for an active ingredient with currently EPA...
• AdditionalityA criterion often applied to greenhouse gas (GHG) project activities, stipulating that project-based GHG...
• Additive1. A substance added in small quantity to another substance, generally conferring some added benefit.
• Additive and Multiplicative BiasLinear regression intercept and slope of a linear plot fitted to corresponding candidate and reference method...
• additive doseThe overall result of exposure to two or more chemicals, when each chemical behaves as a concentration or...
• Additive Effect1. Combined effect of two or more chemicals equal to the sum of their individual effects.
• Additive ExposureCombined exposure or risk summed, assuming each component acts as if the other were not present. [U.S. EPA...
• Additive exposure or riskCombined exposure or risk summed, assuming each component acts as if the other were not present.
• Additive ManufacturerAny person who produces, manufactures, or imports an additive for use as an additive and/or sells or imports...
• Additive RiskCombined exposure or risk summed, assuming each component acts as if the other were not present. [U.S. EPA...
• Additive/Base Fuel MixtureMixture resulting when a fuel additive is added in specified proportion to the base fuel of the fuel family...
• Additivity-Hazard-Index ApproachIf sufficient data are not available on the effects of the chemical mixture of concern or a reasonably...
• Additization1. Addition of detergent to gasoline or post-refinery component in order to create detergent-additized...
• Add-on Air Pollution Control Device1. Equipment installed at the end of a process vent exhaust stack or stacks that reduces the quantity of a...
• Add-on Control1. Air pollution control device, such as a thermal oxidizer or carbon adsorber, that reduces pollution in an...
• Add-on Control Device1. An air pollution control device such as carbon absorber or incinerator that reduces the pollution in an...
• Add-on Control Device EfficiencyRatio of the emissions collected or destroyed by an add-on air pollution control device to the total...
• Add-on Control System1. Air pollution control device such as a carbon absorber or incinerator that reduces pollution in an air...
• Addressed ParameterIn the context of a TMDL, Addressed Parameters refer to associated parameters (parameters identified as...
• Adenine1. Adenine (A) is one of four chemical bases in DNA, with the other three being cytosine (C), guanine (G)...
• AdenoidA fold of lymphatic tissue covered by ciliated epithelium at the very back of the nose, in the roof of the...
• Adenosine TriphosphatasesA group of enzymes which catalyze the hydrolysis of ATP. The hydrolysis reaction is usually coupled with...
• Adenosine Triphosphate1. An organic, phosphate rich compound important in the transfer of energy in organisms. Its central role in...
• ADEQUACY OF DOCUMENTATIONA standard of sufficiently and properly recording actions and/or decisions. See also DOCUMENTATION (1).
• ADEQUATE AND PROPER DOCUMENTATIONA record of the conduct of U.S. Government business that is complete and accurate to the extent required to...
• Adequate Emission Capture MethodHoods, enclosures, or any other duct intake devices with ductwork, dampers, manifolds, plenums, or fans...
• Adequate Sulfur Dioxide Emission LimitationSIP emission limitation which was approved or promulgated by EPA as adequate to attain and maintain the NAAQS...
• Adequately Determined (for purposes of Tier A only)The total mass of all CERCLA hazardous substances in the source and releases from the source (or for the area...
• Adequately Determined (for purposes of Tier B only)The total mass of all hazardous wastestreams and CERCLA pollutants and contaminants for the source and...
• Adequately WetAsbestos containing material that is sufficiently mixed or penetrated with liquid to prevent the release of...
• Adherence factorThe amount of a material (e.g., soil) that adheres to the skin per unit of surface area.
• AdhesionMolecular attraction that holds the surfaces of two substances in contact.
• Adhesion Factor Degradation ProcessBy induction of conjugation, transport, oxidation, and/or proteolysis, Adhesion Factor Degradation consists...
• Adhesion Factor ProductionAny cellular process that results in the elaboration of adhesion molecules on the cell surface.
• Adhesion Factor SuppressionAny cellular process that results in the reduction or loss of adhesion molecules on the cell surface.
• Adhesion Promoter1. Coating designed to facilitate the bonding of a primer or topcoat on surfaces such as trim moldings, door...
• Adhesive1. Substances that cause the adherence of two surfaces. They include glues (properly collagen-derived...
• Adhesive and Sealer MaterialAdhesives, sealers and thinners added to adhesives or sealers.
• Adhesive ApplicatorEquipment that uses open pan-type application (e.g., a roller partially submerged in an open pan of adhesive)...
• Adhesive BondingJoining parts using an adhesive material. Typically, an organic bonding compound is used as the adhesive...
• Adhesive Bonding PrimerPrimer applied in a thin film to aerospace components for the purpose of corrosion inhibition and increased...
• Adiabatic process1. A thermodynamic change of state of a system such that no heat or mass is transferred across the boundaries...
• AdipogenesisThe production of fat, either fatty degeneration or fatty infiltration; also applied to the normal deposition...
• AditA nearly horizontal gallery or passage driven from the surface of the ground to the ore body. The term...
• Adjacent Area1. Bordering, contiguous, or neighboring a water identified in paragraphs (l)(1)(i) through (v) of this...
• Adjacent WetlandsWetlands that (A) Abut, meaning to touch at least at one point or side of, a water identified in paragraph...
• Adjoining PropertyAny real property or properties the border of which is (are) shared in part or in whole with that of the...
• ADJUSTThis indicates that the limitation value is an additive adjustment to the discharge.
• Adjustable Engine Parameter1. Any device, system, or element of design that someone can adjust and that, if adjusted, may affect...
• Adjusted Engine ConfigurationTest configuration after adjustment of engine calibrations to the retrofit specifications, but excluding...
• adjusted exposure concentrationAn estimate of exposure concentration that has been refined, usually by application of an exposure model, to...
• Adjusted Loaded Vehicle Weight1. Numerical average of the vehicle curb weight and the GVWR. [40 CFR 88.102-94 (CFR 2013)].
• AdjuvantVaccine component distinct from the antigen that enhances the immune response to the antigen.
• Administered Dose1. The mass of a substance given to an organism and in contact with an exchange boundary (i.e...
• Administrative ActionEnforcement action taken by EPA or a state under its own authority, without involving a judicial court...
• Administrative Consent AgreementAdministrative agreement used to initiate potentially responsible party (PRP) response or cost recovery.
• Administrative Contracting OfficerRefers to a contracting officer who is administering contracts.
• Administrative Default OrderAn Administrative Default Order may be issued when the defendant/respondent fails to answer an administrative...
• Administrative Hazard Control1. Written procedural mechanisms used for hazard control.
• Administrative HearingAn administrative adjudication required by section 112(b)(2) of CERCLA in the event a claimant contests a...
• Administrative Law Judge1. An Administrative Law Judge appointed under 5 U.S.C. 3105.
• Administrative ManagementAdministrative Management involves the day-to-day management and maintenance of the internal infrastructure.
• Administrative Order1. A legal document signed by EPA directing an individual, business, or other entity to take corrective...
• Administrative Order on Consent1. A legal agreement signed by EPA and an individual, business, or other entity through which the violator...
• Administrative Orders on ConsentA legal agreement signed by EPA and the potentially responsible parties (PRPs) through which the PRP agrees...
• Administrative Procedure ActTo improve the administration of justice by prescribing fair administrative procedure.
• Administrative Procedures Act1. A law that spells out procedures and requirements related to the promulgation of regulations.
• Administrative Proceedings - BasicNon-public communications prepared for the purpose of an alternative dispute resolution (ADR) proceeding.
• Administrative Record1. A set of documents that is the basis for any Federal agency administrative action, including, but not...
• ADMINISTRATIVE RECORD - SUPERFUNDA set of documents which form the basis for selection of a response action under Section 113(j) of the...
• Administrative Records1. Those records created by several or all Federal agencies in performing common facilitative functions that...
• Administrative RequirementThose matters common to grants in general, such as financial management, kinds and frequency of reports, and...
• ADMINISTRATIVE REQUIREMENTSThose matters common to grants in general, such as financial management, kinds and frequency of reports, and...
• Administrative Support WorkerThese jobs involve non-managerial tasks providing administrative and support assistance, primarily in office...
• ADMINISTRATIVE VALUEThe usefulness of records in conducting an agency's current business. Includes fiscal value and legal value...
• ADMINISTRATIVELY CONTROLLED INFORMATIONPrivileged or other nonsecurity-classified information in records sometimes bearing designations, such as...
• Administrative/Voluntary Cost RecoveryPotentially responsible party reimbursement of Superfund expenditures in direct response to EPA demand...
• Administrator1. The Administrator of the United States Environmental Protection Agency or his authorized representative.
• Administrator, EPA, and Regional Administrator1. Shall have the meanings set forth in § 124.2, except when EPA has delegated authority to administer those...
• Administrator’s Authorized RepresentativeDirector in charge of radiation programs at the Agency.
• Admitted PolicyAn insurance policy that is written and issued in a specific locale, by an insurer authorized to transact...
• Adnexa UteriAppendages of the uterus which include the fallopian tubes, the ovary, and the supporting ligaments of the...
• AdolescentA human in the 12 to 18 year old age range.
• Adolescent ExposureContact with a substance by swallowing, breathing, or touching the skin or eyes by a teenager, ages 10 to 19
• AdoptionReferring to states adopting Federal regulations. As an initial step toward obtaining final authorization, a...
• Adrenal Gland1. A flattened, roughly triangular body resting upon the upper end of each kidney; it is one of the ductless...
• Adrenergic Receptor InhibitorAn inhibitor of a family of G protein-coupled receptors that bind catecholamines and play a role in the...
• Adrenocorticotropic HormoneAn anterior pituitary hormone that stimulates the adrenal cortex and its production of corticosteroids. ACTH...
• adsorbTo take up and hold (a gas, liquid, or dissolved substance) in a thin layer of molecules on the surface of a...
• Adsorbable Organic HalideA bulk parameter that measures the total mass of chlorinated organic matter in water and wastewater. The...
• Adsorbate(add-SORE-bait) The material being removed by the adsorption process.
• Adsorbent1. (add-SORE-bent) The material (activated carbon) that is responsible for removing the undesirable substance...
• Adsorption1. The retention of atoms, ions, or molecules on the surface of another substance.
• Adsorption ProcessRemoval of a pollutant from air or water by collecting the pollutant on the surface of a solid material...
• Adsorption TechnologyRemoval of pollutants from air or water by collecting the pollutant on the surface of a solid material; e.g...
• Adsorptive MediaRemoval of pollutants via surface adhesion to media, not elsewhere classified (e.g., new materials).
• Adsorptive Media with Iron-Based ProductsAn arsenic treatment technology process that passes contaminated water through a bed of solid media upon...
• AdultA person having attained full growth or maturity. Adults are of 19 through 44 years of age.
• AdulterantsChemical impurities or substances that by law do not belong in a food, or pesticide.
• Adulterated1. Any pesticide whose strength or purity falls below the quality stated on its label.
• ADVANCEA payment made by treasury check or other appropriate payment mechanism to a recipient upon its request...
• Advance AllowanceAllowance that may be used for purposes of compliance with a source Acid Rain sulfur dioxide emissions...
• Advance AuctionAuction of advance allowances.
• Advance CreditAny credits of an approved in-lieu fee program that are available for sale prior to being fulfilled in...
• Advance Credit Sale1. Application of credits released in accordance with a credit release schedule in an approved mitigation...
• Advance PaymentPayment made to a recipient before ‘‘outlays’’ are made by the recipient.
• Advance Restoration Plan (ARP)Advance Restoration Plan (in advance of TMDL development) is a near-term plan, or description of actions...
• Advance SaleSale of advance allowances.
• advance treatment systemsAny treatment of sewage that goes beyond the secondary or biological water treatment stage and includes the...
• Advanced Air Emission Control DeviceAir pollution control equipment, such as electrostatic precipitators and high energy scrubbers, that are used...
• Advanced BiofuelRenewable fuel, other than ethanol derived from cornstarch, that has lifecycle greenhouse gas emissions that...
• Advanced Coal TechnologyAdvanced coal technology, such as integrated gasification combined cycle (IGCC), can achieve higher power...
• Advanced Emissions/Pollutant Detection TechnologyEnables regulated entities, the government, and the public to more easily see pollutant discharges...
• Advanced Extrapolation MethodAny one of the more complicated procedures for estimating the value of a variable outside its known range.
• Advanced Oxidation Processes, NECTechnologies that use the hydroxyl radical (-OH) for oxidation, not elsewhere classified (NEC).
• Advanced Persistent ThreatAn adversary that possesses sophisticated levels of expertise and significant resources which allow it to...
• Advanced QueryThe method for generating a report from the database that is geared towards users who are familiar with the...
• Advanced Secondary TreatmentBiological or chemical treatment processes added to a secondary treatment plant including a conventional...
• Advanced Technology Air Conditioning CompressorAir conditioning compressor with improved efficiency relative to fixed-displacement compressors. Efficiency...
• Advanced Technology VehicleVehicle that combines new engine, power, or drivetrain systems to significantly improve fuel economy. This...
• Advanced TelevisionNew television technology that provides better audio and video quality than the current standard television...
• Advanced TreatmentA level of wastewater treatment more stringent than secondary treatment; requires an 85-percent reduction in...
• Advanced Treatment SystemAny treatment of sewage that goes beyond the secondary or biological water treatment stage and includes the...

2,484 of 30,736 terms in Environment terminology (MLC-0121). Request the full dataset.