Title

Remote Sensing of Ammonia and Sulfur Dioxide from On-Road Light Duty Vehicles

Document Type

Article

Publication Date

2006

Publication Title

Environmental science & technology

Department

Chemistry

Abstract

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.

ISSN

0013-936X