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CHARACTERIZATION OF EMISSIONS FROM MOTOR VEHICLES DESIGNED FOR LOW N0X EMISSIONS
Citation:
Smith, L. CHARACTERIZATION OF EMISSIONS FROM MOTOR VEHICLES DESIGNED FOR LOW N0X EMISSIONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-80/176 (NTIS PB81155327), 1980.
Description:
Tailpipe emissions were characterized for four advanced low NOx catalyst equipped passenger cars under a variety of cyclic driving conditions. All of the vehicles had three-way catalysts, three with feedback carburetors and exhaust gas recirculation, and two with oxidation catalysts following the three-way catalysts. The emission rates of several unregulated pollutants including aldehydes, organic amines, sulfur dioxide, nitrous oxide, several individual hydrocarbons (including benzene), hydrogen sulfide, cyanide, organic sulfides, nickel carbonyl, ammonia, sulfate, trace metals, and N-nitrosodimenthylamine were determined. Additionally, the emission rates of the regulated pollutants, total hydrocarbons, carbon monoxide, and oxides of nitrogen were determined along with carbon dioxide and oxygen. Using three test fuels of varying sulfur content, the emissions were examined at an initial mileage and at 5,000-mile intervals to 15,000 miles. Using a toxicity criteria, the most significant emissions were the currently regulated pollutants; sulfate was the most significant unregulated pollutant. Using commuter exposure models, exposures less than 0.07 OSHA 8-hour Threshold Limit Values are projected for typical congested freeway situations.