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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...

    Annually. Light duty diesel emission inspections are conducted by using an opacity meter and dynamometer. A visual inspection for tampering of emission control devices is also part of the inspection procedure. Emissions testing is required in: The Las Vegas Valley and within a five-mile buffer zone around it.

  4. Vehicle inspection - Wikipedia

    en.wikipedia.org/wiki/Vehicle_inspection

    An inspection sticker from the Commonwealth of Massachusetts A Warrant of Fitness certificate issued to vehicles in New Zealand. Vehicle inspection is a procedure mandated by national or subnational governments in many countries, in which a vehicle is inspected to ensure that it conforms to regulations governing safety, emissions, or both.

  5. 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. They are generally designed to achieve air quality standards and to protect ...

  6. North Carolina Safety and Emission Vehicle Inspection

    en.wikipedia.org/wiki/North_Carolina_Safety_and...

    In addition, any vehicle in one of the 48 Safety and Emission counties that has a Gross Vehicle Weight Rating (GVWR) greater than 8,500 pounds only requires a Safety inspection. [ 2 ] As of April 1, 2015 North Carolina General Statute 20-183.2 exempts certain vehicles within the most recent three model years, and having fewer than 70,000 miles ...

  7. California Smog Check Program - Wikipedia

    en.wikipedia.org/wiki/California_Smog_Check_Program

    The program included a biennial and change of ownership testing, "BAR 84" emissions test plus a visual and functional inspection of various emission control components, a $50 repair cost limit (unless emission device tampering was noted), licensing shops to perform smog checks and mechanic certification for emissions repair competence. [18]

  8. Vehicle emissions control - Wikipedia

    en.wikipedia.org/wiki/Vehicle_emissions_control

    The regulatory requirements of the Clean Air Act, which was amended many times, greatly restricted acceptable vehicle emissions. With the restrictions, vehicles started being designed more efficiently by utilizing various emission control systems and devices which became more common in vehicles over time.

  9. On-board diagnostics - Wikipedia

    en.wikipedia.org/wiki/On-board_diagnostics

    This OBD-II came in two models OBD-IIA and OBD-IIB. OBD-II standardization was prompted by emissions requirements, and though only emission-related codes and data are required to be transmitted through it, most manufacturers have made the OBD-II Data Link Connector the only one in the vehicle through which all systems are diagnosed and ...