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United States emission standards
In the United States, emissions standards are managed on a national level by the Environmental Protection Agency (EPA). State and local governments may apply for waivers to enact stricter regulations.
== Motor vehicles ==
Due to its preexisting standards and particularly severe motor vehicle air pollution problems in the Los Angeles metropolitan area, the U.S. state of California has special dispensation from the federal government to promulgate its own automobile emissions standards. Other states may choose to follow either the national standard or the stricter California standards.
States adopting the California standards include Arizona (2012 model year), Connecticut, Maine, Maryland, Massachusetts, New Jersey, New Mexico (2011 model year), New York, Oregon, Pennsylvania, Rhode Island, Vermont, and Washington, as well as the District of Columbia. Such states are frequently referred to as "CARB states" in automotive discussions because the regulations are defined by the California Air Resources Board.
The EPA has adopted the California emissions standards as a national standard by the 2016 model year〔(【引用サイトリンク】title=EPA and NHTSA Finalize Historic National Program to Reduce Greenhouse Gases and Improve Fuel Economy for Cars and Trucks )〕 and is collaborating with California regulators on stricter national emissions standards for model years 2017–2025.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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