2023-03198: Finding of Failure To Attain the 1987 24-Hour PM10 Standards; Pinal County, Arizona
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The Environmental Protection Agency (EPA) is proposing to determine that the West Pinal County, Arizona nonattainment area did not attain the 1987 24-hour national ambient air quality standards (NAAQS or "standards") for particulate matter with a diameter of 10 micrometers or smaller (PM<INF>10</INF>) by its December 31, 2022 "Serious" area attainment date. This proposal is based on the EPA's calculation of the preliminary PM<INF>10</INF> design value for the nonattainment area over the 2020-2022 period. If the EPA makes a final determination that West Pinal County has failed to attain the PM<INF>10</INF> NAAQS by its attainment date, the State will be required to submit a revision to the Arizona state implementation plan (SIP) that, among other elements, provides for expeditious attainment of the PM<INF>10</INF> standards and for a five percent annual reduction in the emissions of direct PM<INF>10</INF> or a PM<INF>10</INF> plan precursor pollutant in the nonattainment area.
The agency’s own summary, as published.
What this changes
Amends 1 part of the Code of Federal Regulations — the standing rules this notice rewrites.
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