The Exceptional Events Rule (EER) provides a way for states to flag air quality data for possible exclusion when NAAQS compliance is determined, provided the EPA concurs with the supporting documentation, and the event contributing to the data meets certain criteria. Exceptional Events are those events that impact air quality but are not reasonably controllable, and not likely to reoccur. Wildland fires are among the exceptional events states flag under this rule.
On September 16, 2016 the EPA finalized its revisions to the 2007 Exceptional Events Rule. EPA's webpages and documents outlining the new rule, guidance, and other resources are listed below.
Exceptional Events Rule Resources
Treatment of Data Influenced by Exceptional Events - EPA information page for the Exceptional Events Rule and its status, links to:
Exceptional Events Rule and Guidance - EPA's Exceptional Events Rule guidance page which includes: