Air Quality State Implementation Plans; Approvals and Promulgations: Arizona; Prevention of Significant Deterioration Infrastructure Requirements for the 2012 Fine Particulate Matter National Ambient Air Quality Standard; Withdrawal
EPA withdraws its approval of Arizona's Prevention of Significant Deterioration (PSD) infrastructure requirements for the 2012 fine particulate matter (PM2.5) National Ambient Air Quality Standard (NAAQS), meaning Arizona's SIP no longer meets federal requirements for this standard.
Aforeworn detected this change in the Environmental & Emissions Compliance (EPA) space on August 5, 2026 and published this briefing so affected operators are forewarned rather than caught off guard. It is rated Medium urgency. Manufacturers, power generators, chemical processors, and other facilities in Arizona subject to PSD permitting for PM2.5 emissions. should confirm how it applies to their specific situation before acting. There is a time constraint attached: No specific deadline is stated in the change text.. Acting after that point can mean penalties, a lapsed licence, or lost eligibility — exactly the kind of surprise Aforeworn exists to prevent. Aforeworn monitors Environmental & Emissions Compliance (EPA) continuously and turns every detected change into a plain-English briefing like this one, so you always know first. Forewarned is forearmed.
What changed
The EPA is withdrawing its prior approval of Arizona's PSD infrastructure SIP for the 2012 PM2.5 NAAQS, which may affect how PSD permits are reviewed and issued in Arizona.
Who it affects
Manufacturers, power generators, chemical processors, and other facilities in Arizona subject to PSD permitting for PM2.5 emissions.
What you must do
Facilities should monitor EPA and Arizona Department of Environmental Quality (ADEQ) announcements for revised SIP requirements and ensure any pending PSD permit applications are prepared to meet potentially stricter federal oversight.
Deadline
No specific deadline is stated in the change text.
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