Air Plan Approval; California; State Implementation Plan Revision for Chico, Modesto and Stockton Carbon Monoxide Maintenance Areas
air-emissions · Rule · Published 2025-09-05 · Effective 2025-10-06 · CA · 90 FR 42829
Document
Document number
2025-17061
Federal Register citation
90 FR 42829
CFR reference
40 CFR 52
Type
Rule
Action
Final rule.
Category
air-emissions
Publication date
2025-09-05
Effective date
2025-10-06
State
CA
EPA docket
EPA-R09-OAR-2024-0473
Abstract
The Environmental Protection Agency (EPA) is taking final action to approve a revision to the California state implementation plan (SIP) that removes carbon monoxide (CO) contingency measures and monitoring requirements from the maintenance plan for three CO maintenance areas: Chico Urbanized Area, Modesto Urbanized Area, and Stockton Urbanized Area. We are approving the revision under the Clean Air Act (CAA or "Act").