Ozone Exceedance Data
The web pages in this listing display what we call the Ozone Exceedance Summary for the ozone season. Ozone season runs from April 1st through September 30th. The summary includes the date, monitor name(s) with their highest 8-hour average for the day for each time 8-hour ozone values exceed the National Ambient Air Quality Standard. Unless otherwise noted, this data has not yet been QA'd but is considered valid.
