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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. California Smog Check Program - Wikipedia

    en.wikipedia.org/wiki/California_Smog_Check_Program

    The American flag stands against the backdrop of a smoggy Los Angeles in 1972. 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]

  4. California Bureau of Automotive Repair - Wikipedia

    en.wikipedia.org/wiki/California_Bureau_of...

    Licenses Smog Check stations, technicians, and inspectors. Licenses brake and lamp stations and adjusters. Mediates automotive repair complaints, saving California consumers millions of dollars each year in the form of direct refunds, rework, and bill adjustments. Investigates and takes disciplinary action against licensees who violate the law.

  5. United States vehicle emission standards - Wikipedia

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

    The Clean Air Act of 1963 (CAA) was passed as an extension of the Air Pollution Control Act of 1955, encouraging the federal government via the United States Public Health Service under the then-Department of Health, Education, and Welfare (HEW) to encourage research and development towards reducing pollution and working with states to establish their own emission reduction programs.

  6. ZIP Code - Wikipedia

    en.wikipedia.org/wiki/ZIP_Code

    A ZIP Code (an acronym for Zone Improvement Plan [1]) is a system of postal codes used by the United States Postal Service (USPS). The term ZIP was chosen to suggest that the mail travels more efficiently and quickly [2] (zipping along) when senders use the code in the postal address.

  7. Pollution in California - Wikipedia

    en.wikipedia.org/wiki/Pollution_in_California

    A view of Los Angeles covered in smog. Pollution in California relates to the degree of pollution in the air, water, and land of the U.S. state of California.Pollution is defined as the addition of any substance (solid, liquid, or gas) or any form of energy (such as heat, sound, or radioactivity) to the environment at a faster rate than it can be dispersed, diluted, decomposed, recycled, or ...

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

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

    After years of compliance, the Idaho Department of Environmental Quality wants to get rid of Ada County’s emissions testing program, claiming the usefulness of the program has run out.

  9. Secondary air injection - Wikipedia

    en.wikipedia.org/wiki/Secondary_air_injection

    The pump's air intake is filtered by a rotating screen or the vehicle air filter to exclude dirt particles large enough to damage the system. Air is delivered under light pressure to the injection point(s). A check valve prevents exhaust forcing its way back through the air injection system, which would damage the pump and other components.