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. While the waiver addresses California’s ability to enforce its rules, the Clean Air Act also allows other states the ability to adopt California’s policies.

Nitrogen Oxides 238

Nitrogen Oxides Clean Air Act Fossil Fuels Ozone 238

Legal Planet

AUGUST 22, 2023

States and local air quality regulators have the legal authority to set particulate matter (PM), ozone, and nitrogen oxides (NOx) emissions standards and adopt regulations for these pollutants when they are already in attainment of the national ambient air quality standards ( NAAQS ) set by the U.S.

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Regulations Ozone Air Pollution Clean Air Act 130

Environment, Law, and History

AUGUST 27, 2023

Dan Farber at Legal Planet recently posted on "Cars, Smog, and EPA" An excerpt: For the first 20 years of federal regulation, Congress set the NOx [nitrogen oxides] standards for new cars itself. That’s quite different from the standards for industrial pollution sources, which Congress has always delegated to EPA.

Nitrogen Oxides 52

Nitrogen Oxides Clean Air Act Pollution Control 2004 52

Union of Concerned Scientists

MAY 17, 2023

Ground-level ozone pollution is a nasty air pollutant that can cause lung problems and asthma attacks. Sadly, the process of setting an outdoor ozone pollution standard has a long history of being undermined by political leaders under the Bush, Obama, and Trump administrations.

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Ozone Ground-Level Ozone Air Pollution Clean Air Act 204