Stationary and Area Source Emissions
Air
pollutants are released, or emitted, into the atmosphere from
stationary, area, and mobile sources. Stationary source
emissions are those air pollutants emitted from identified utility,
industrial, institutional and commercial facilities operating at
fixed locations.
Stationary sources are further classified as “major” or “minor,”
depending on the magnitude of their emissions. Examples of major stationary sources
are electric power plants, phosphate processing plants, pulp and paper
mills, and municipal waste combustors. Minor sources include most
asphalt plants, concrete batch plants, and bulk gasoline plants.
Area source emissions
are those air pollutants emitted from many individually small activities
such as gasoline service stations, small paint shops, and consumer use of
solvents. Area sources also include open burning associated with
agriculture, forest management, and land clearing activities.
Periodically, the
amounts of emissions from all sources are estimated and compiled into
emissions inventories.
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