Clean Air Act Government 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
Legal Planet
APRIL 24, 2025
ISRs are especially powerful because local air districts dont have very many effective ways to tackle pollution from mobile sources, which is typically the province of the federal government. In those two air districts that have adopted this pioneering form of regulation, ISRs have led to resounding success.
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Union of Concerned Scientists
JUNE 17, 2025
We can rebuild it—we have the technology (and lax regulations) Under the Clean Air Act, the Environmental Protection Agency sets emissions standards for engines in new locomotives. But it isn’t just the waiver request where the federal government has been missing in action. For example, the rail industry leads to $3.3
Union of Concerned Scientists
JANUARY 21, 2025
Decades of government vehicle standards to improve vehicle efficiency and cut down on tailpipe pollution have saved car and truck drivers trillions of dollars at the pump, saved countless lives from reduced exposure to toxic air pollution , and avoided the extraction and burning of billions of barrels of oil. In the U.S.,
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
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. As a person in SoCal with asthma, cleaner air is especially important. as you probably know, pollution reigns in SoCal. We need you to do even better!
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.
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