Air Quality State Implementation Plans; Approvals and Promulgations: Pennsylvania; Redesignation of the Warren County Nonattainment Area to Attainment and Approval of the Area's Maintenance Plan for the 2010 1-Hour Primary Sulfur Dioxide NAAQS
EPA redesignates Warren County, PA from nonattainment to attainment for the 2010 1-hour SO2 standard and approves its maintenance plan. No new requirements for businesses; existing controls remain.
Aforeworn detected this change in the Environmental & Emissions Compliance (EPA) space on July 29, 2026 and published this briefing so affected operators are forewarned rather than caught off guard. It is rated Low urgency. Sources of sulfur dioxide (SO2) in Warren County, PA, including power generators, manufacturers, and chemical processors. should confirm how it applies to their specific situation before acting. There is a time constraint attached: Not applicable.. 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
Warren County is now designated as attainment for the 2010 1-hour SO2 NAAQS, and its maintenance plan is approved. No new emission limits or reporting requirements are imposed.
Who it affects
Sources of sulfur dioxide (SO2) in Warren County, PA, including power generators, manufacturers, and chemical processors.
What you must do
No action required. Continue to comply with existing state and federal SO2 regulations.
Deadline
Not applicable.
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