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  2. United States vehicle emission standards - Wikipedia

    en.wikipedia.org/wiki/United_States_vehicle...

    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 ...

  3. Vehicle inspection in the United States - Wikipedia

    en.wikipedia.org/wiki/Vehicle_inspection_in_the...

    Vehicle emissions inspection station in Wisconsin. Arizona – biennially, in Phoenix and Tucson metro areas only, depending on age and type of vehicle. [28]California – biennially for all vehicles from out-of-state, regardless of age; and all vehicles made after 1975 which are more than six years old in all or some zip codes in 41 out of 58 counties.

  4. Emission standard - Wikipedia

    en.wikipedia.org/wiki/Emission_standard

    Emission standards are the legal requirements governing air pollutants released into the atmosphere. Emission standards set quantitative limits on the permissible amount of specific air pollutants that may be released from specific sources over specific timeframes.

  5. Landmark rule requires some companies to share how much they ...

    www.aol.com/landmark-rule-requires-companies...

    The newly adopted rule dropped one of the most contentious elements of the SEC’s initial March 2022 proposal, requiring companies to disclose emissions they are indirectly responsible for ...

  6. US to soften tailpipe rules, slow EV transition through 2030

    www.aol.com/news/biden-administration-relax-ev...

    WASHINGTON (Reuters) -U.S. President Joe Biden's administration is set to ease proposed yearly requirements through 2030 of its sweeping plan to aggressively cut tailpipe emissions and ramp up ...

  7. As electric vehicle sales slow, US relaxes plans for stricter ...

    www.aol.com/news/epa-expected-relax-auto...

    U.S. electric vehicle sales grew 47% last year to a record 1.19 million as EV market share rose from 5.8% in 2022 to 7.6%. But EV sales growth slowed toward the end of the year. In December, they ...

  8. Regulation of greenhouse gases under the Clean Air Act

    en.wikipedia.org/wiki/Regulation_of_greenhouse...

    Section 202(a)(1) of the Clean Air Act requires the Administrator of the EPA to establish standards "applicable to the emission of any air pollutant from…new motor vehicles or new motor vehicle engines, which in [her] judgment cause, or contribute to, air pollution which may reasonably be anticipated to endanger public health or welfare" (emphasis added). [3]

  9. On-board diagnostics - Wikipedia

    en.wikipedia.org/wiki/On-board_diagnostics

    On-board diagnostics (OBD) is a term referring to a vehicle's self-diagnostic and reporting capability. In the United States, this capability is a requirement to comply with federal emissions standards to detect failures that may increase the vehicle tailpipe emissions to more than 150% of the standard to which it was originally certified. [1 ...