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  2. 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.

  3. 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 ...

  4. Ford Proving Grounds - Wikipedia

    en.wikipedia.org/wiki/Ford_Proving_Grounds

    Aerial view of the Ford Arizona Proving Ground. Latitude and longitude: The Arizona Proving Ground opened in 1985. The Proving Ground consists of 1,498 acres (6.06 km 2) located less than one hour northwest of the Phoenix Sky Harbor Airport at an elevation of 1,650 feet (500 m).

  5. Treasure Valley vehicle emissions tests are going away. But ...

    www.aol.com/treasure-valley-vehicle-emissions...

    What Ada County requires on emissions testing Emissions testing has been federally mandated in northern Ada County since the 1980s, when air quality in the region violated federal standards .

  6. Idaho wants to end vehicle emissions testing. How will that ...

    www.aol.com/news/idaho-wants-end-vehicle...

    The emissions testing program in Canyon County and Kuna began in 2010 because of an Idaho law that required vehicle emissions tests in airsheds where an ambient air pollutant is at or above 85% of ...

  7. Emission standard - Wikipedia

    en.wikipedia.org/wiki/Emission_standard

    The "10 - 15 Mode Hot Cycle" test, used to determine individual fuel economy ratings and emissions observed from the vehicle being tested, use a specific testing regime. [ 41 ] [ 42 ] [ 43 ]

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  9. GM's Cruise to start testing robotaxis in Phoenix area with ...

    www.aol.com/news/gms-cruise-start-testing-robot...

    Testing will start in Phoenix and gradually expand to Scottsdale, Tempe, Mesa, Gilbert, Chandler and Paradise Valley, the company said. GM's Cruise to start testing robotaxis in Phoenix area with ...