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Multi-Pollutant Emissions Standards

Rules that limit the amount of several different types of pollutants, like those contributing to smog and climate change, that new vehicles can release into the air.

Light-Duty and Medium-Duty Vehicles

Categories of vehicles that include most passenger cars, SUVs, smaller trucks, and some larger pickup trucks and vans, typically defined by their weight.

Clean Air Act

A major federal law that regulates air emissions from stationary and mobile sources, establishing national standards for air quality.

Tailpipe Regulations

Rules set by the government that control the amount of harmful substances (like carbon monoxide, nitrogen oxides, and particulates) that can be emitted from a vehicle's exhaust pipe.

Federal Register (Fed. Reg.)

The official daily publication for rules, proposed rules, and notices of federal agencies and organizations, as well as executive orders and other presidential documents.