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Electricity

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Particle Pollution

Why UCS Supporters Are Pressing EPA to Let California Enforce Its Truck Pollution Rules

Union of Concerned Scientists

DECEMBER 1, 2022

California has a longstanding leadership role on transportation pollution, and the Clean Air Act grants the state the right to set strong vehicle emissions standards. Truck pollution is killing us, the planet, and it stinks. Truck pollution is a national issue, and in the absence of federal leadership, states have taken the helm.

Nitrogen Oxides

Nitrogen Oxides Clean Air Act Ozone Fossil Fuels

Nearly Half of US Breathes Unhealthy Levels of Pollution—Cars and Trucks Largely to Blame

Union of Concerned Scientists

MAY 21, 2025

are formed indirectly in the atmosphere from other toxic pollutants also emitted from tailpipes. Since then, there has been much progress in cleaning up our air, the result of effective environmental policies that control combustion emissions from sources such as power plants, industry, ports, warehouses and our vast network of roads.

Ozone

Ozone Ground-Level Ozone Air Pollution Clean Air Act

Why UCS Supporters Are Pressing EPA to Let California Enforce Its Truck Pollution Rules

Nearly Half of US Breathes Unhealthy Levels of Pollution—Cars and Trucks Largely to Blame

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