This Week at the Environmental Protection Agency — week of July 27, 2026

This week, the Environmental Protection Agency issued 11 actions, almost all of them administrative: updating state air quality paperwork, correcting clerical errors, and aligning federal records with air that has already met federal standards. No new pollution limits were created, and no new health-based requirements were imposed. The most significant proposals would formally recognize improved ozone and sulfur dioxide levels in Detroit, parts of Michigan, and a county in Pennsylvania.

Air quality status for Detroit, Michigan, and Pennsylvania

• The EPA proposed redesignating the Detroit area as in “attainment” for the 2015 federal ozone standards, meaning local air now meets Clean Air Act requirements. The change would also set the formal rules for how much pollution motor vehicles can emit in the region through 2040.
• The EPA proposed reclassifying Berrien County and western Muskegon County in Michigan. Both areas are currently under stricter ozone classifications; the change would align records with actual measurements and affect how the state monitors emissions and reports data, without creating new pollution limits.
• The EPA proposed changing how Warren County, Pennsylvania, is categorized under the Clean Air Act for sulfur dioxide, following a request from the state’s environmental agency. It is an administrative update to match official records with current conditions.

State air quality plan updates

• The EPA approved two rules from the San Joaquin Valley Air Pollution Control District in California, formalizing how the district manages ozone pollution as part of the state’s plan to meet federal standards.
• The EPA approved updated definitions for “hazardous air pollutant” and “regulated air pollutant” in New Hampshire, keeping state paperwork consistent with federal law without changing permit rules.
• The EPA updated the list of documents officially included in Rhode Island’s State Implementation Plan. This only corrects the paperwork that points to existing air quality standards; the standards themselves are unchanged.
• The EPA proposed approving revisions to Missouri’s State Implementation Plan that clarify when a business does not need a construction permit to install an emergency generator.
• The EPA proposed narrowing the legal excuses available to companies that violate air permit requirements during an emergency in four California air districts: Amador County, Calaveras County, Great Basin Unified, and Northern Sierra.

Chemical safety and oversight

• The EPA extended compliance deadlines for two chemicals, perchloroethylene (PCE) and carbon tetrachloride (CTC), under Toxic Substances Control Act risk-management rules. The change aligns schedules for private businesses and contractors with existing federal agency deadlines, giving companies more time to implement safety protocols.
• The EPA corrected a clerical error in a previous rule about epyrifenacil, a pesticide, fixing paperwork on residue limits for corn, wheat, and soybeans.
• The EPA proposed new notification requirements for certain chemical substances previously covered by EPA orders and premanufacture notices, so the agency can review changes in how those chemicals are used before they reach the marketplace.

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This weekly agency digest is generated from federal records (the Federal Register and Congress.gov) and summarized in plain English. It may simplify or omit detail — follow the linked official sources before relying on any item. Part of The Boring Parts.