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Ozone Designations

Ozone Designations Regulatory Actions

This page contains a chronological listing of all regulatory actions related to designations for the 2015 ozone standards.

December 22, 2017 - EPA responds to state and tribal recommendations by indicating the anticipated area designations for the remaining portions of the U.S.  Learn more

November 6, 2017 – Consistent with the states’ and tribes’ recommendations, EPA designates most of the U.S. “attainment/unclassifiable” for the 2015 ozone standards. Learn more

August 2, 2017 -Withdrawal of Extension of Deadline for Promulgating Designations for the 2015 Ozone National Ambient Air Quality Standards.  Read the Withdrawal of Extension Notice.

June 6, 2017 - The Administrator has determined that there is insufficient information to complete area designations for the 2015 ozone standards and is extending the deadline by one year, until October 1, 2018. Learn more

State representatives and some tribal representatives have submitted area designation recommendations for the 2015 ozone standards.