Definition
A mathematical prediction of how pollutants from a discharge or emission source will be distributed in the surrounding environment under given conditions of wind, temperature, humidity, and other environmental factors.
See also:
Air Quality Standards
The level of selected pollutants set by law that may not be exceeded in outside air. Used to determine the amount of pollutants that may be emitted by industry.
Emission
The release or discharge of a substance into the environment. Generally refers to the release of gases or particulates into the air.
Emission Standards
Government standards that establish limits on discharges of pollutants into the environment (usually in reference to air).