The report describes the results of exhaust emissions measurements reported by licensed automotive repair dealerships participation in the California motor vehicle inspection and maintenance (I/M) program called Smog Check. The results have been compared to measurements made on the same vehicles at the California Air Resources Board (ARB) laboratory. Based on an experimental program conducted by ARB the Smog Check station exhaust emission test results appear to be invalid for about 17.5% of the vehicles. The report describes the issues involved.


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    Evaluation of the California Smog Check Program

    Sommerville, R.J. / Austin, Thomas C. / Cackette, Tom | SAE Technical Papers | 1987


    Evaluation of the California Smog Check Program

    Sommerville,R.J. / Cackette,T. / Austin,T.C. | Kraftfahrwesen | 1987


    Operational Aspects of the California Smog Check Program

    Dyer,M.B. / Sherwood,L.D. / Hunter,G.T. et al. | Kraftfahrwesen | 1987


    Operational Aspects of the California Smog Check Program

    Hunter, Gary T. / Sherwood, Larry D. / Dyer, Martin B. | SAE Technical Papers | 1987