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Two sets, or tiers, of emission standards for light-duty vehicles in the United States were defined as a result of the Clean Air Act Amendments of 1990. The Tier I standard was adopted in 1991 and was phased in from 1994 to 1997. Tier II standards were phased in from 2004 to 2009. Within the Tier II ranking, there is a subranking ranging from ...
The Environmental Protection Agency (EPA) announced a final rule in March under the Clean Air Act to set new emissions standards that would require up to two-thirds of new cars sold to be electric ...
The EPA rule applies to model years 2027 to 2032 and would avoid more than 7 billion tons of planet-warming carbon emissions over the next three decades, providing nearly $100 billion in annual ...
On April 12, 2023, EPA proposed new federal vehicle tailpipe emissions standards that would accelerate the transition to electric vehicles (EVs). The standards would require at least two-thirds of all new cars sold in the United States to be zero-emissions vehicles by 2032. The rules seek to reduce air pollution and climate change.
In the United States, emissions standards are managed by the Environmental Protection Agency (EPA). It uses tiers to identify emission standards for cars, trucks and other motor vehicles. [ 8 ] In 2014, the EPA published its "Tier 3" standards for these vehicles, which tightened air pollution emission requirements and lowered the sulfur content ...
Since New Mexico adopted its own rules in 2021 and 2022, the average monthly amount of methane emissions in the air has decreased by 55% and routine venting and flaring by New Mexico oil and gas ...
National Ambient Air Quality Standards. US counties that are designated "nonattainment" for the Clean Air Act's NAAQS, as of September 30, 2017. The U.S. National Ambient Air Quality Standards (NAAQS, pronounced / ˈnæks / naks) are limits on atmospheric concentration of six pollutants that cause smog, acid rain, and other health hazards. [1]
EPA, which concluded that the federal government cannot use the U.S. Clean Air Act to dictate how utilities generate energy, but can set technology-based standards to make power plants operate ...