Characterization of Exhaust Emissions from High Mileage Catalyst-Equipped Automobiles

This paper describes the characterization of regulated and unregulated exhaust emissions, particularly aldehydes, from ten 1978 and 1979 high mileage catalyst-equipped gasoline fueled automobiles which have been driven for approximately 50,000 miles. The ten automobiles were evaluated as-received and after a tune-up to manufacturer’s specifications, over the Light-Duty Federal Test Procedure (FTP) and the Highway Fuel Economy Driving Schedule (HFET). Exhaust constituents measured, in addition to the regulated emissions, include: aldehydes, particulates, sulfides, amines, and several additional compounds.