Any precipitation that is more acidic than normal; rain containing acid
Any material that causes air pollution
The presence of materials in the air that damage 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
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
Small solid particles of air pollution
Point source pollution
A specific place where air pollution originates
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