Nonattainment Information

Currently, for the 2015 Ozone National Ambient Air Quality Standards (NAAQS) – the most stringent ozone standard – all of Wyoming’s counties are meeting the standard and are in the process to be designated as attainment/unclassifiable by the U.S. Environmental Protection Agency (EPA).

What is a Ozone Nonattainment Area?

A ozone nonattainment area is one in which air quality does not meet the ozone standards set forth by the Federal government. On October 1, 2015, EPA revised the 8-hour primary and secondary National Ambient Air Quality Standards for ozone by lowering the level from 75 parts per billion (ppb) to 70 ppb.



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