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PROPOSED RULECOMMENTS DUE NOVEMBER 9, 2026

Air Quality Plan; Arizona; Maricopa County Air Quality Department; New Source Review; Emission Reduction Credits-Rule 204

Environmental Protection Agency

The U.S. Environmental Protection Agency (EPA) is proposing to approve a revision to the Maricopa County Air Quality Department (MCAQD or "Department") portion of the Arizona State Implementation Plan (SIP). This revision establishes a federally enforceable program allowing nonroad engine fleet owners/operators to generate emission reduction credits (ERCs) by either retrofitting their nonroad engines or replacing their nonroad engines with lower-emitting nonroad engines while meeting other Clean Air Act (CAA or "Act") requirements. These ERCs are intended for use as offsets for major stationary sources under the Department's Nonattainment New Source Review (NNSR) program. We are proposing to approve a local rule to allow for the generation of ERCs through voluntary nonroad engine emission reductions under the CAA.

Published October 8, 2026Document 2026-20612
Read on FederalRegister.gov ↗Official PDF ↗Comment on Regulations.gov ↗

How to comment

Comments are due November 9, 2026. Submit through the link above or follow the instructions in the document's ADDRESSES section. Say who you are, how the rule affects you, and what should change, with evidence. Comments are usually public, so leave out anything private.

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From the Federal Register as of November 3, 2026. Deadlines can change; the official document governs. Not legal advice.

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