Nonattainment New Source Review (NNSR)

Current understanding

To be populated as evidence accumulates.

2026-10-08 — Air Quality Plan; Arizona; Maricopa County Air Quality Department; New Source Review; Emission Reduction Credits-Rule 204: cross-connection with emission-reduction-credits: Maricopa County Rule 204 ties off-road mobile-source emission reductions directly into the NNSR offset supply used when major industrial sources permit expansions. (novelty: 2)
2026-10-08 — Air Plan Approval; GA; Removal of Nonattainment Area New Source Review: 2026 — EPA approved Georgia SIP revision removing NNSR permitting rules from the state plan on the basis that Georgia currently has no NAAQS nonattainment areas, a routine cleanup of obsolete permitting requirements. (novelty: 2)