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Environmental Protection Agency (EPA)

A federal agency responsible for protecting human health and the environment by writing and enforcing regulations based on laws passed by Congress.

Clean Air Act

A major federal law that regulates air emissions from stationary and mobile sources, authorizing the EPA to establish National Ambient Air Quality Standards to protect public health and the environment.

Tailpipe regulations

Rules set by the government that limit the amount of pollutants, such as greenhouse gases or other harmful substances, that can be emitted from a vehicle's exhaust pipe.

Heavy-Duty Vehicles

Large vehicles typically used for commercial purposes, such as tractor-trailers, dump trucks, delivery trucks, and buses.

Greenhouse Gas Emissions

Gases released into the atmosphere, primarily from burning fossil fuels, that trap heat and contribute to climate change. Examples include carbon dioxide and methane.

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.