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EPA Publishes Final Rule to Reclassify Denver Area to “Serious” Nonattainment for Ozone

Published: January 8, 2020

As anticipated, on December 26th , the US Environmental Protection Agency (EPA) published a final rule reclassifying the Denver Metro/North Front Range ozone nonattainment area from Moderate to Serious.  The final rule outlines the planning requirements for a Serious area, which is consistent with the elements and timeline the RAQC, in close coordination with the Colorado Air Pollution Control Division and EPA Region 8 staff, have been working under for more than a year.  While the Serious Area Ozone State Implementation Plan (SIP) deadline in the final rule is August 3, 2020, due to the unique requirement in Colorado that SIP’s go through the State legislature, the SIP is anticipated to be submitted to EPA in early 2021, following RAQC and Colorado Air Quality Control Commission (AQCC) approval in 2020. 

EPA’s press release can be found here.