States may not restrict emissions from motor vehicles.

Question

Quizplus · Accepted Answer

States are allowed to establish their own vehicle emission standards, but they must meet the minimum requirements set by the Environmental Protection Agency (EPA) under the Clean Air Act. This is known as the "California waiver," which allows California to set more stringent standards than federal regulations and other states to adopt those standards if they choose. However, the Trump administration has recently attempted to revoke this waiver, which is currently being challenged in court.

States May Not Restrict Emissions from Motor Vehicles