Clean Air Act Greenhouse Nitrogen Oxides 
Union of Concerned Scientists
MAY 21, 2025
The report provides renewed evidence of the consequences for our health of using fossil fuels In 1970 the Clean Air Act and the newly formed Environmental Protection Agency (EPA) were given authority by Congress to regulate pollution from passenger cars and other forms of transportation. Secondary PM 2.5
Union of Concerned Scientists
JANUARY 21, 2025
California is allowed to set standards stronger than the federal government under the 1970 Clean Air Act provisions in recognition that CA, and many other states which have adopted CA standards , serve an important role as laboratories of innovation controlling air pollution in novel ways. In the U.S.,
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Legal Planet
APRIL 10, 2025
And the search for gold bars has shockingly been fruitless EPA Administrator Lee Zeldin has said that the greenhouse gas reduction program was vulnerable to waste, fraud, and abuse. And about the EPA having that email address set up for copy and paste exemptions to the Clean Air Act, which my colleague Mary D.
Union of Concerned Scientists
MARCH 25, 2025
Cleaner cars, cleaner air Our Cleaner Cars, Cleaner Air Report showed that while pre-2004 cars make up fewer than 20% of the cars on the road, they are responsible for the majority of tailpipe pollution because they produce higher amounts of lung-damaging particulate pollution and contribute significantly more smog-forming nitrogen oxide emissions.
Union of Concerned Scientists
JULY 16, 2025
Under Section 111 of the Clean Air Act, where the power plant carbon standards sit , a source category—such as the power sector—is only regulated if that source “causes, or contributes significantly” to air pollution demonstrated to endanger public health or welfare. There are a few critical pieces to unpack here.
Union of Concerned Scientists
AUGUST 21, 2024
Most prominently, because the approach is changing from rewarding specific technologies to rewarding anything that meets the greenhouse gas (GHG) emissions threshold of “clean”—hence the “tech-neutral” label—exactly how the government goes about determining whether or not something is actually eligible will be enormously important.
Union of Concerned Scientists
JUNE 3, 2024
The Climate Pollution Reduction Grants (CPRG) program provides $5 billion in grants to states, local governments, tribes, and territories to develop and implement ambitious plans for reducing greenhouse gas emissions and other harmful air pollution. billion for competitive implementation grants.
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