Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 40, Issue 22, Pages 7018-7022Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es061161r
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This study reports the largest data set of on-road, fuel-based mass emissions of ammonia and sulfur dioxide from vehicles of known make, model year, and fuel type. Ammonia is the first pollutant observed for which the emissions decrease with increasing fleet age from 10 to 20 years. The fixed nitrogen emission ratio is 15.0% by mass and 24.7% by mole, larger than current models predict. Diesel fueled vehicles emit more SO2 than gasoline, and unexpectedly, gasoline SO2 emissions decrease continuously with newer model year vehicles.
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