Based on drive-by sensor measurement of the hydrocarbon (HC) emissions of 23,000 in-use cars in Riverside, CA, only 0.2% (approximately one car in 500) account for 13% of the total HC emissions and 1% account for about 25% of total HC output. Joel Schwartz, an experienced researcher in the field, who directed the California Governor’s Inspection/Maintenance (I/M) Policy Review Committee for several years, managed the study by the Reason Foundation, a public policy analysis group. ...

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