Where can I find historical or archived air quality and emissions data?

Historical air quality and emissions data are located in several databases that can be linked to from this site:

http://www.epa.gov/air/airpolldata.html

Some of the databases provide summary data, while others provide more detailed values. Reports, maps, and other displays are available.

Archived maps are available on AIRNow.gov:

http://www.airnow.gov/index.cfm?action=airnow.maps

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Where can I find historical or archived air quality and emissions data?

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