A discussion of the Clean Air Act (CAA), its amendments, and significant caselaw pertaining to clean air regulation in the US ...

During the early 1970s, the air in many American cities was … brown. Pollution muddied clear skies and sickened people across ...

The US Clean Air Act (CAA) has improved air quality, but not equally for all people. According to a new study, while pollutant emissions have decreased over time, ...

The Clean Air Act has been cheaper and more effective than industry predicts, again and again For decades, industry economists have overestimated the cost of air-quality regulations.

The Supreme Court on Wednesday issued two rulings on where certain challenges to actions taken by the Environmental Protection Agency under the Clean Air Act must be filed. In the […] ...

On June 18, 2025, the Supreme Court decided Oklahoma v. EPA and EPA v. Calumet, a pair of cases that focus on the Clean Air ...

The U.S. Environmental Protection Agency (EPA) has finalized rulemaking originally proposed in 2016 to remove "emergency" affirmative defense provisions from its Clean Air Act (CAA) permitting ...

While the Republican-led U.S. House and Senate in the 115th Congress was mainly focused on reviewing, for modification or repeal, several environmental rules issued under the Clean Air Act (CAA ...