Real-world vehicle emissions: A summary of the ninth coordinating researchcouncil on-road vehicle emissions workshop

In April 1999, the Coordinating Research Council sponsored a workshop focus ing on our understanding of real-world emissions from motor vehicles. This summary presents the latest information on in-use light- and heavy-duty veh icle tailpipe and evaporative emissions, the effects of fuels on emissions, field programs designed to understand the contribution of mobile sources t o emission inventories, efforts to evaluate and improve mobile source emiss ion models, progress of vehicle inspection/maintenance programs, and topics for future research. While significant progress has been made in understan ding in-use vehicle emissions, further improvements are necessary. Moreover , the impact of current and future changes in emission control technologies and control programs will have to be monitored for effectiveness and incor porated into the emission factor models.