Anti-Tampering and Anti-Misfueling Programs to Reduce In-Use Emissions from Motor Vehicles

摘要

EPA has been collecting data since 1978 on the occurrence of tampering and misfueling to assess the magnitude of the problem. This report examines the rates of tampering and misfueling, the effects of misfueling and disablement of individual emission control components on vehicle emissions, which vehicles are equipped with each emission component, and the estimated cost of repairs. The methodology used to estimate the excess emissions caused by tampering is explained. Programs to prevent misfueling are discussed. Also included is the use of the MOBILE3 emission factor model used to calculate the adjustments to local conditions.