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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. California Smog Check Program - Wikipedia

    en.wikipedia.org/wiki/California_Smog_Check_Program

    The California Smog Check Program is an attempt to reduce smog in California. The California Smog Check Program requires vehicles that were manufactured in 1976 or later to participate in the biennial (every two years) smog check program in participating counties. [1] The program's stated aim is to reduce air pollution from vehicles by ensuring ...

  4. Vehicle emission standard - Wikipedia

    en.wikipedia.org/wiki/Vehicle_emission_standard

    Under federal law, the state of California is allowed to promulgate more stringent vehicle emissions standards (subject to EPA approval), and other states may choose to follow either the national or California standards. California had produced air quality standards prior to EPA, with severe air quality problems in the Los Angeles metropolitan ...

  5. California can once again set its own emissions rules, EPA says

    www.engadget.com/epa-reinstates-california...

    California is known for pushing stricter emissions requirements than the federal government, standards which have also been adopted by 16 other states and Washington, D.C.

  6. Toyota accepts California’s authority to set emissions ...

    techcrunch.com/2022/08/23/toyota-accepts...

    Seventeen U.S. states have agreed to adopt California’s tailpipe emissions rules and 15 are adopting the state’s zero-emission vehicle requirements. California aims to ban the sale of new gas ...

  7. GM finally agrees California can set vehicle emissions rules ...

    techcrunch.com/2022/01/10/gm-finally-agrees...

    GM’s recognition of California’s much stricter carbon emissions standards, which other states can adopt, means the state will consider the company for fleet vehicle purchases. Other companies ...

  8. California push for zero-emissions heavy trucks starts in 2024

    www.engadget.com/california-push-for-zero...

    Fri, Jun 26, 2020 · 1 min read. Nikola. The state of California is requiring all trucks to be zero-emission beginning in 2024, thanks to a new mandate from the California Air Resources Board. The ...

  9. California bill would require all self-driving vehicles to be ...

    techcrunch.com/2021/03/05/california-bill-would...

    The amendment is in line with many of California’s goals to reduce emissions. It would add to the state’s vehicle code, which currently provides for programs to promote zero-emission vehicles ...