Data / Federal rules / 2026-07405

Air Plan Revisions; Arizona; Maricopa County Air Quality Department; New Source Review; Emission Reduction Credits

The Environmental Protection Agency published this proposed rule in the Federal Register on April 16, 2026. Comments closed on May 18, 2026.

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What the agency says

The 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 fleet owners/operators to generate emission reduction credits (ERCs) by either retrofitting or replacing existing fleet vehicles with lower emitting vehicles 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 on-road mobile source emission reductions under the CAA. We are taking comments on this proposal and plan to follow with a final action.

Key facts

Document number: 2026-07405
Type: Proposed rule
Action: Proposed rule
Agency: Environmental Protection Agency
Published: April 16, 2026
Comments due: May 18, 2026
Dates: Comments must be received on or before May 18, 2026.
Docket: EPA-R09-OAR-2026-1684; FRL-13268-01-R9
Code of Federal Regulations: 40 CFR 52
Topics: Administrative practice and procedure; Air pollution control; Environmental protection; Incorporation by reference; Intergovernmental relations; Nitrogen oxides; Ozone; Reporting and recordkeeping requirements; Volatile organic compounds
Pages: 4

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on administrative practice and procedure · Rules on air pollution control · Rules on environmental protection · Published in April 2026

Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.