Study of Emissions from Light Duty Vehicles in Los Angeles

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Study of Emissions from Light Duty Vehicles in Los Angeles

R. A. Cassidy / L. S. Kingston

This report presents and summarizes exhaust emissions test data and other related information obtained in the testing and inspection of in-use passenger cars. The test fleet consisted of 1978-81 automobiles and trucks. The test vehicles were obtained randomly from private owners in the Los Angeles and Orange County areas. Each vehicle was tested as received, for exhaust emissions utilizing the 1975 Federal Test Procedure, the Highway Fuel Economy Test (HFET) and four short mode tests. One hundred twenty-five 1980-81 vehicles received an evaporative emission test using the sealed housing evaporate determination (SHED) technique. Twenty-two of the 292 vehicles received restorative maintenance repairs and additional testing. Four 1981 vehicles were specially selected throttle body injection vehicle (TBI) which received a baseline emission test and four (4) additional disablement Cold Start test sequences.