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The Climate Litigation Database

Massachusetts v. EPA

Geography
🇺🇸 United States / District of Columbia
Year
2026
Document Type
Litigation
Part of
American Public Health Association v. EPA

About this case

Filing year
2026
Status
Petition for review filed.
Geography
🇺🇸 United States → District of Columbia
Docket number
26-1061
Court/admin entity
United States → United States Court of Appeals for the District of Columbia (D.C. Cir.)United States → United States Federal Courts
Case category
Federal Statutory Claims (US) → Clean Air Act (US) → Environmentalist Lawsuits (US)
Principal law
United States → Administrative Procedure Act (APA)United States → Clean Air Act (CAA)
At issue
Challenges to the U.S. Environmental Protection Agency’s final rule rescinding the 2009 greenhouse gas endangerment finding under the Clean Air Act and repealing all greenhouse gas emission standards for motor vehicles and engines.

Documents

Filing Date
Document
Type
Search results
03/19/2026
Petition for review filed.
On March 19, 2026, Massachusetts, 24 other states and territories, the District of Columbia, and 12 local governments filed a petition for review challenging the final rule.
Petition
–

Summary

Challenges to the U.S. Environmental Protection Agency’s final rule rescinding the 2009 greenhouse gas endangerment finding under the Clean Air Act and repealing all greenhouse gas emission standards for motor vehicles and engines.