The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the Commonwealth of Pennsylvania on behalf of the Allegheny County Health Department (ACHD). The revision updates Allegheny County's portion of the Pennsylvania SIP, which includes regulations concerning sulfur content in fuel oil. This revision pertains to the reduction of the maximum allowable sulfur content limit for Number 2 (No.

The Environmental Protection Agency (EPA) is approving a revision to the Oregon State Implementation Plan (SIP) submitted on November 5, 2020. The revision establishes new fees to be paid by stationary sources of air contaminants that submit notices of intent to construct. The revision also adds a new basic air contaminant discharge permit category to allow certain minor sources, that would otherwise be required to obtain a general, simple, or standard permit, the option to qualify for a basic permit.

The Environmental Protection Agency (EPA) is proposing to approve four permitting rules submitted as a revision to the San Diego County Air Pollution Control District (SDAPCD or ``District'') portion of the California State Implementation Plan (SIP). These revisions concern the District's New Source Review (NSR) permitting program for new and modified sources of air pollution under section 110(a)(2)(C) and part D of title I of the Clean Air Act (CAA or ``Act'').

The Environmental Protection Agency (EPA) is taking final action to approve revisions to the Mojave Desert Air Quality Management District (MDAQMD) and the Placer County Air Pollution Control District (PCAPCD) portions of the California State Implementation Plan (SIP). These revisions concern emissions of volatile organic compounds (VOCs) from metal coating operations and general regulatory definitions.