California new motor vehicle emission certification standards and emission test results for the 1988 model-year are summarized. Automobile manufacturers' responses to the new on-board malfunction and diagnostics regulations are discussed. The various emission control systems and methods used by manufacturers to comply with new requirements are described. Sales-weighted averages of projected useful life emissions, deterioration factors, horsepower, torque and engine displacements, and percentage usage of various emission control systems/components are calculated for each category of motor vehicles or engines. A comparison with the 1987 model year and conclusions regarding trends in emissions and emission control system usage to meet future proposed standards are made.


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