Finding of Failure To Submit a State Implementation Plan To Meet the 1987 24-Hour PM10
The Environmental Protection Agency (EPA) is making a finding that Arizona has not submitted a required revision to the Arizona State Implementation Plan (SIP) for the West Pinal County nonattainment area addressing Clean Air Act (CAA) requirements for a Moderate area attainment plan, related rules, and other analyses needed to attain the 1987 24-hour particulate matter (PM10) National Ambient Air Quality Standard (NAAQS) by December 31, 2018. Under the CAA, Arizona was required to submit a moderate area PM10 attainment plan for West Pinal County no later than January 2, 2014, and the State did so on December 21, 2015. On May 17, 2021, Arizona withdrew its Moderate area attainment plan submission. This finding establishes a deadline for EPA to promulgate a Federal Implementation Plan (FIP) to address these CAA requirements 24 months from the effective date of this finding. The CAA also provides for the imposition of sanctions if Arizona does not submit the required attainment plan within timeframes specified by the CAA.