Clean Air Plans; Base Year Emissions Inventories for the 2015 Ozone Standards; Arizona; Phoenix-Mesa and Yuma Nonattainment Areas

Publication Date: 
Friday, October 22, 2021 - 4:00am

The Environmental Protection Agency (EPA) is proposing to approve, under the Clean Air Act (CAA), revisions to the Arizona State Implementation Plan (SIP) concerning the base year emissions inventory requirements for the Phoenix-Mesa ozone nonattainment area (``Phoenix- Mesa'') and Yuma ozone nonattainment area (``Yuma'') for the 2015 ozone national ambient air quality standards (NAAQS or ``standard'').

Environmental Protection Agency