Area Source

{
  "id": "MLC-T-ENV-002075",
  "term": "Area Source",
  "field": "Environment",
  "definition": "1. Any source of air pollution that is released over a relatively small area but which cannot be classified as a point source. Such sources may include vehicles and other small engines, small businesses and household activities, or biogenic sources such as a forest that releases hydrocarbons.\n\n2. A stationary source that emits less than 10 tons per year of a single hazardous air pollutant (HAP) or 25 tons per year of all HAPs combined.\n\n3. In the context of the Clean Air Act, air toxics provisions, any stationary source that falls below a major source threshold of emissions (see Major Source definition), such as a dry cleaner or gas station. The term generally excludes motor vehicles (both road and non-road).\n\n4. Any small residential, governmental, institutional, commercial, or industrial fuel combustion operations; onsite solid waste disposal facility; motor vehicles, aircraft vessels, or other transportation facilities or other miscellaneous sources identified through inventory techniques similar to those described in the “AEROS Manual series, Vol. II AEROS User's Manual,” EPA-450/2-76-029 December 1976.\n\n5. Any stationary source of HAP that is not a major source.\n\n6. Any source that does not meet the major source definition.\n\n7. Stationary and nonroad sources that are too small and/or too numerous to be individually included in a stationary source emissions inventory.\n\n8. Source of air pollution that is released over an area that cannot be classified as a point source. Area sources can include vehicles and other small engines, small businesses and household activities, or biogenic sources such as a forest that releases hydrocarbons.\n\n9. Include sources that generally have lower emissions on an individual basis than \"major sources\" and are often too small or ubiquitous to be inventoried as individual sources. \"Area sources\" include facilities that have air toxics emissions below the major source threshold as defined in the air toxics sections of the Clean Air Act and thus emit less than 10 tons of a single toxic air pollutant or less than 25 tons of multiple toxic air pollutants in any one year. Area sources include smaller facilities, such as dry cleaners. Definition 2: As a separate definition, area sources in air-quality modeling refer to those modeled in two dimensions (with length and width), as compared to point sources modeled at a single location.\n\n10. Any perchloroethylene dry cleaning facility that meets the conditions of § 63.320(h).\n\n11. Sources of air pollution that, by themselves, generally have lower emissions than “major sources” of air pollution (like factories). Area sources can include smaller facilities, such as gas stations, or widespread sources like smoke from home fireplaces. In air quality modeling, area sources are those modeled in two dimensions (with length and width), as compared to point sources modeled at a single point location.\n\n12. A source of air pollution that is released over an area that cannot be classified as a point source. Area sources can include vehicles and other small engines, small businesses and household activities, or biogenic sources such as a forest that releases hydrocarbons.",
  "abbreviation": "AS",
  "subject": "Air",
  "references": [
    "Terms of Environment",
    "Improving Air Quality in Your Community Glossary",
    "Community-Based Air Pollution Projects Glossary",
    "40 CFR 51.100 (CFR 2013)",
    "40 CFR 63.1595 (CFR 2013)",
    "40 CFR 63.2872 (CFR 2013)",
    "40 CFR 51.491 (CFR 2013)",
    "Report on the Environment (ROE) Glossary",
    "National Air Toxics Assessment (NATA) Glossary",
    "40 CFR 63.321 (CFR 2018)"
  ],
  "url": "https://mlchart.com/terminology/environment/area-source/"
}