EPA Concurs with Colorado 2017 Wildfire Exceptional Events for Ozone

On July 11, 2018, EPA notified the State of Colorado of concurrence with a request to exclude ozone data influenced by wildfire exceptional events in September 2017.  These events resulting in several monitors exceeding the 2008 ozone standard on September 2 and 4, 2017.  This concurrence now enables EPA to approve the State’s request to extend the attainment deadline for the region by one year to July 20, 2019.

EPA Letter