Nitrogen oxide

{
  "id": "MLC-T-ENV-018647",
  "term": "Nitrogen oxide",
  "field": "Environment",
  "term_source": "Nitrogen Oxide",
  "definitions": [
    "1. The result of photochemical reactions of nitric oxide in ambient air; major component of photochemical smog. Product of combustion from transportation and stationary sources and a major contributor to the formation of ozone in the troposphere and to acid deposition.\n\n2. A generic term for the nitrogen oxides that are most relevant for air pollution, namely nitric oxide (NO) and nitrogen dioxide (NO₂). These gases contribute to the formation of smog and acid rain, as well as tropospheric ozone.",
    "1. The result of photochemical reactions of nitric oxide in ambient air; major component of photochemical smog. Product of combustion from transportation and stationary sources and a major contributor to the formation of ozone in the troposphere and to acid deposition.\n\n2. NOx is the collective term for nitrogen compounds such as NO and NO2. Nitrogen oxides are an environmental and public health concern because human activity has increased their concentration in the atmosphere. NO and NO2 are interconvertible and are precursor molecules for the production of ground-level ozone.\n\n3. Gases consisting of one molecule of nitrogen and varying numbers of oxygen molecules. Nitrogen oxides are produced in the emissions of vehicle exhausts and from power stations. In the atmosphere, nitrogen oxides can contribute to formation of photochemical ozone (smog), can impair visibility, and have health consequences; they are thus considered pollutants.\n\n4. A group of gases that cause acid rain and other environmental problems, such as smog and eutrophication of coastal waters. Burning fossil fuels such as coal and gasoline releases NOx into the atmosphere. For more information, visit EPA's Air and Radiation Web site\n\n5. A group of gases made up of nitrogen and oxygen that cause acid rain and other environmental problems, such as smog and eutrophication of coastal waters. Burning fossil fuels, such as coal and gasoline, releases NOx into the atmosphere. Various programs are reducing NOx emissions, including the Acid Rain Program and NOx cap and trade programs.\n\n6. Nitrogen oxides are the product of combustion from transportation and stationary sources and a major contributor to the formation of ozone in the troposphere and to acid deposition.\n\n7. Gases consisting of one molecule of nitrogen and varying numbers of oxygen molecules. Nitrogen oxides are produced, for example, by the combustion of fossil fuels in vehicles and electric power plants. In the atmosphere, nitrogen oxides can contribute to formation of photochemical ozone (smog), impair visibility, and have health consequences; they are considered pollutants.\n\n8. Nitrogen compounds such as NO and NO₂ produced by combustion. They help to from ozone and photochemical smog.\n\n9. All oxides of nitrogen except nitrous oxide, as measured by test methods set forth in this part.\n\n10. Sum of nitric oxide and nitrogen dioxide in the flue gas or emission point, collectively expressed as nitrogen dioxide.\n\n11. Nitric oxide and nitrogen dioxide. Oxides of nitrogen are expressed quantitatively as if the nitric oxide were in the form of nitrogen dioxide (oxides of nitrogen are assumed to have a molecular weight equivalent to nitrogen dioxide).\n\n12. Meaning given in 40 CFR 1065.1001. [40 CFR 1039.801 (CFR 2013)][40 CFR 1042.901 (CFR 2013)][40 CFR 1033.901 (CFR 2013)]\n\n13. NO and NO2 as measured by the procedures specified in § 1065.270. Oxides of nitrogen are expressed quantitatively as if the NO is in the form of NO2, such that you use an effective molar mass for all oxides of nitrogen equivalent to that of NO2.\n\n14. Sum of nitric oxide (NO) and nitrogen dioxide (NO2) in the flue gas, expressed as nitrogen dioxide.\n\n15. Sum of nitrogen oxide (NO) and nitrogen dioxide (NO2) in the flue gas, expressed as nitrogen dioxide.\n\n16. Oxides of nitrogen and is defined as the sum of the concentrations of NO2 and NO.\n\n17. Nitrogen oxide.\n\n18. Generic term for the nitrogen oxides that are most relevant for air pollution, namely nitric oxide (NO) and nitrogen dioxide (NO₂). These gases contribute to the formation of smog and acid rain, as well as tropospheric ozone.\n\n19. Oxides of nitrogen except nitrous oxide (N2 O), reported on an equivalent molecular weight basis as nitrogen dioxide (NO2).\n\n20. A family of highly reactive gases (including nitrogen dioxide, above) that form when fuel is burned at high temperatures. Emitted principally from motor vehicle exhaust and stationary sources such as electric power plants and industrial boilers."
  ],
  "abbreviation": "NOx",
  "synonyms": [
    "NOₓ",
    "NMHC+NOX"
  ],
  "subject": [
    "Air",
    "Chemical substances"
  ],
  "references": [
    "Terms of Environment",
    "CMAQ Glossary",
    "Terms of Env",
    "Heat Island Effect Glossary",
    "Clean Energy Glossary; Glossary of Climate Change Terms; Climate Change Glossary",
    "Greening EPA Glossary",
    "Acid Rain Glossary",
    "Importing Vehicles and Engines Glossary",
    "Greenhouse Gas Emissions",
    "I-BEAM Glossary of Terms",
    "40 CFR 60.2 (CFR 2013)",
    "40 CFR 51.900 (CFR 2013); 40 CFR 51.1100 (CFR 2013); 40 CFR 51.1300 (CFR 2019)",
    "40 CFR 92.2 (CFR 2013); 40 CFR 94.2 (CFR 2013)",
    "40 CFR 1036.801 (CFR 2013); 40 CFR 1037.801 (CFR 2013); 40 CFR 1045.801 (CFR 2013); 40 CFR 1048.801 (CFR 2013); 40 CFR 1051.801 (CFR 2013); 40 CFR 1054.801 (CFR 2013)",
    "40 CFR 1065.1001 (CFR 2013)",
    "40 CFR 49.5512 (CFR 2013)",
    "40 CFR 49.5513 (CFR 2013)",
    "40 CFR 58.1 (CFR 2013); 40 CFR 53.1 (CFR 2013)",
    "40 CFR 53.1 (CFR 2013)",
    "Community Multiscale Air Quality (CMAQ) Glossary",
    "86 FR 23054; 40 CFR 97.402 (CFR 2021)",
    "America's Children and the Environment Terms"
  ],
  "url": "https://mlchart.com/terminology/environment/nitrogen-oxide/"
}