Long-Term Efficiency of Catalytic converters Operating in Mexico City

摘要

A 1999 ordinance by the government of Mexico City bans 1993 model-year vehicles from on-road operation if their catalytic converters are not replaced with new ones. To validate the benefits of this action. We examined three issues related to exhaust emissions of vehicles equipped with catalytic converters. After selecting representative fleets of in-sue vehicles, a comparison between emissions and catalyst efficiency in cars with two categories of ex- haust emission limits was carried out.