Real-World Emissions from Model Year 1993, 2000 and 2010 Passenger Cars

Research Report T953


Marc Ross, Rob Goodwin, Rick Watkins, Michael Q. Wang, and Tom Wenzel


Presents a pathbreaking study that enhances our collective understanding of why actual automotive emissions (of the criteria pollutants CO, HC, and NOx) greatly exceed the values expected from tighter tailpipe standards. The authors’ extensive data analysis reveals key reasons for high emissions, identifies opportunities for substantial emissions reductions, and provides recommendations (for both regulators and automakers) for realizing these gains by more careful design of on-board emissions control systems.