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.
Last updated: September 25, 2013