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United States vehicle emission standards are set through a combination of legislative mandates enacted by Congress through Clean Air Act (CAA) amendments from 1970 onwards, and executive regulations managed nationally by the Environmental Protection Agency (EPA), and more recently along with the National Highway Traffic Safety Administration (NHTSA).
Emission standards set quantitative limits on the permissible amount of specific air pollutants that may be released from specific sources over specific timeframes. They are generally designed to achieve air quality standards and to protect human life. Different regions and countries have different standards for vehicle emissions.
The emission standards for trucks (lorries) and buses are defined by engine energy output in g/kWh; this is unlike the emission standards for passenger cars and light commercial vehicles, which are defined by vehicle driving distance in g/km — a general comparison to passenger cars is therefore not possible, as the kWh/km factor depends ...
The U.S. Environmental Protection Agency on Wednesday granted California its request to enforce vehicle emissions standards stricter than federal rules, including the state's ban on sales of new ...
The Supreme Court declined to hear a challenge from Ohio and 16 other conservative states that aimed to strip California of its authority to adopt vehicle emissions standards stricter than federal ...
Challenges to California’s authority to set vehicle emissions standards date back to when George W. Bush was president in the 2000s, said Ann Carlson, an environmental law professor at the ...
1998: Diesel engine standards further increased in efforts to reduce ozone and PM emissions for various vehicles including industrial equipment. 1999: Tailpipe emission standards are finalized, sulfur contents in gasoline are reduced, and various boats/other marine vehicles using diesel had reduced emission limits for NOx and PM. [7]
The dispute centers on an exception granted to California in 2022 by the U.S. Environmental Protection Agency to national vehicle emission standards set by the agency under the landmark Clean Air ...