Catalytic Control of Mutagenic Exhaust Emissions from Gasoline Passenger Cars

Extracts of exhaust emissions from passenger cars equipped with conventional and lean-burn gasoline engines were tested for PAHs, NPAHs and mutagenicity. When installed with an appropriate three-way or oxidation catalyst very large reductions in each of these measurements were observed, alongside reductions in regulated emissions and gaseous aldeyhdes. These beneficial effects were apparent over U.S. and European cycles.