Emissions deterioration of U.S. gasoline light-duty vehicles and trucks
Large amounts of remote sensing measurements collected over a span of time provide useful insight into emissions deterioration, or the increasing emissions as a function of vehicle age. This case study investigates the deterioration trends among light-duty vehicles using the TRUE Initiative’s U.S. database. For all pollutants, there are approximately linear increases in emission levels as vehicles age. Results indicate that U.S. emissions regulations have become increasingly effective at limiting emissions deterioration. However, deterioration rates calculated using remote sensing data appear to be higher than deterioration rate projections from vehicle manufacturers.
Colorado Department of Public Health & Environment, Virginia Department of Environmental Quality, University of Denver
TRUE North American Database: Real-world emissions measurements provided from partners in the Denver Metropolitan area and North Front range in Colorado, and Northern Virginia.
