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Acid rain

Any precipitation that is more acidic than normal; rain containing acid

Air pollutant

Any material that causes air pollution

Air pollution

The presence of materials in the air that damage air quality

Air quality

The suitability of the air for use by living organisms

Air quality standard

The maximum level of atmospheric pollution allowed at one time in a geographical area

Emission

A gas-borne pollutant that is released into the air

Nonpoint source pollution

Pollution from sources that cannot be directly traced to any single point of discharge

Particulates

Small solid particles of air pollution

Point source pollution

A specific place where air pollution originates

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