Historical Air Quality Data

The historical data available here includes

• Exceedances of the 8-hour ozone standard, 1998 - 2005 (standard is now in question; big: about 126 kbytes)
• Exceedances of the 1-hour ozone standard, 1985 - 2005 (big: about 107 kbytes)
• Exceedances of the carbon monoxide standard, 1985 - 2005

This exceedance information gives the date, location, and measured concentration for each time pollutant levels went above these health standards.

Other data are available by contacting us for printed reports or through U.S. EPA's AIRS database.