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The Climate Litigation Database
Litigation

Massachusetts v. EPA

Date
2003
Geography
District of Columbia
Part of
Massachusetts v. EPA

About this case

Filing year
2003
Status
Standing granted; EPA required to decide whether to regulate greenhouse gases under the Clean Air Act. 547 U.S. 497 (2007).
Geography
United States → District of Columbia
Docket number
05-1120
Court/admin entity
United States → Federal Courts → U.S.
Case category
Federal Statutory Claims → Clean Air Act
Principal law
United States → Clean Air Act (CAA)
At issue
Challenge to decision by EPA not to regulate GHGs from mobile sources under the Clean Air Act.

Documents

Filing Date
Type
Action Taken
Document
Summary
04/02/2007
Decision
Standing granted; EPA required to decide whether to regulate greenhouse gases under the Clean Air Act. 547 U.S. 497 (2007).
View
The Supreme Court found that Massachusetts had satisfied the requirements for standing. The Supreme Court further concluded that greenhouse gases are air pollutants under the Clean Air Act, and that EPA must determine under Section 202(a) of the Clean Air Act whether greenhouse gas emissions from new motor vehicles cause or contribute to air pollution that would endanger public health or welfare.
08/31/2006
Brief
Brief filed by petitioners.
View
–

Summary

Challenge to decision by EPA not to regulate GHGs from mobile sources under the Clean Air Act.