Nitrogen Oxides, Particle Pollution and Technology - Environmental Professionals Connection

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

Union of Concerned Scientists

DECEMBER 1, 2022

California’s leadership on reducing truck pollution has been on full display the past few years, passing critical regulations requiring 90 percent reduction in smog-forming nitrogen oxide (NO X ) emissions from diesel trucks and requiring manufacturers sell an increasing share of electric trucks to move away from fossil fuels altogether.

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

referred to as secondary emissions – is formed in the atmosphere from precursor pollutants that also originate from the combustion in fossil-fuel powered engines, such as nitrogen oxides (NO x ), sulfur dioxide (SO 2 ) and volatile organic compounds (VOCs). But beyond this primary formation of PM 2.5 , even more PM 2.5

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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