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Air Trends
This website compiles air quality trends in "the levels of these pollutants in the air and how much of each pollutant (or the pollutants that form them) is emitted from various pollution sources." Find national and local data on carbon monoxide, ground-level ozone, lead, nitrogen dioxide, particulate matter, and sulfur dioxide. Also includes special studies and regulatory statistics. From the U.S. Environmental Protection Agency (EPA).
http://www.epa.gov/airtrends/
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