Urban air pollution: Oxidized and reduced N in a real-world traffic situation
Abstract
Emissions of both particulate and gaseous air pollutants often exceed those of emission inventories like the HBEFA in urban regions. This discrepancy is probably due to the still poor information on real-world traffic emission patterns. The project LUFTHY combined high-resolution vehicle fleet data as obtained with traffic cameras with fast-response measurements of NOx, O3, CO2, particulate matter (PM) and NH3 to improve our understanding of real-world urban air pollution patterns. The stationary campaign took place in an urban street canyon in the city center of Münster, NW Germany (51˚ 57'48.5"N 7˚ 37'52.9"E), for two months from September 2018 to November 2018. Besides the often discussed traffic-related air pollutants NOx, the NH3 concentrations were also measured to determine the role of SCR-systems of diesel vehicles as a local source for ammonia in urban air. It is expected that significant amounts of NH3 could be emitted from traffic due to poorly adjusted exhaust gas treatment. The results indicate significantly higher NH3 concentrations during rush hour compared to times of low traffic density. Emission ratios for well-defined, real-world traffic situations will be presented. On the long run, the results of this project should contribute to an improved understanding of NH3 emissions, secondary PM formation and eventually to help mitigate urban air pollution.
- Publication:
-
EGU General Assembly Conference Abstracts
- Pub Date:
- April 2019
- Bibcode:
- 2019EGUGA..2110914E