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  2. Portable emissions measurement system - Wikipedia

    en.wikipedia.org/wiki/Portable_emissions...

    A CATI PEMS being strapped down inside a vehicle. A portable emissions measurement system (PEMS) is a vehicle emissions testing device that is small and light enough to be carried inside or moved with a motor vehicle that is being driven during testing, rather than on the stationary rollers of a dynamometer that only simulates real-world driving.

  3. Smoke testing (mechanical) - Wikipedia

    en.wikipedia.org/wiki/Smoke_testing_(mechanical)

    Smoke testing refers to various classes of tests of systems, usually intended to determine whether they are ready for more robust testing. The expression probably was first used in plumbing in referring to tests for the detection of cracks, leaks or breaks in closed systems of pipes.

  4. Vehicle emissions control - Wikipedia

    en.wikipedia.org/wiki/Vehicle_emissions_control

    Emission test results from individual vehicles are in many cases compiled to evaluate the emissions performance of various classes of vehicles, the efficacy of the testing program and of various other emission-related regulations (such as changes to fuel formulations) and to model the effects of auto emissions on public health and the environment.

  5. California Smog Check Program - Wikipedia

    en.wikipedia.org/wiki/California_Smog_Check_Program

    Test-and-repair station, one that can both perform the smog check and repair the vehicle. Repair-only station, one that can only repair the vehicle, but cannot perform the test itself. STAR station, one that meets the BAR's higher performance standards. Some STAR stations are test-only stations, while other STAR stations are test-and-repair. [24]

  6. United States vehicle emission standards - Wikipedia

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

    Only state which still conduct emission testing dating back to the 1967 model year unlike other states using EPA classification (a few still conduct test for 1968–present (1968+ testing is for jurisdictions using defined EPA standards for vehicle classification since the '68 model year and beyond automobiles must have an exhaust emission ...

  7. Smoke testing - Wikipedia

    en.wikipedia.org/wiki/Smoke_testing

    Smoke testing may refer to: Smoke testing (electrical) looking for smoke when powering electrical items for the first time; Smoke testing (mechanical) the practice of using smoke to test for leaks; Smoke testing (software) trying the major functions of software before carrying out formal testing; Smoke testing, with theatrical smoke and fog

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