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
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions above and try again
Reload the page to try again!
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Your microphone is muted
For help fixing this issue, see this FAQ.
NEW! Voice Recording
Click the mic to start.