To estimate benzo[a]pyrene concentrations at the roadsides and crossroads in Osaka City, the emission factors of benzo[a]pyrene for three gasoline cars and five diesel cars were measured by using portable sampling equipment that directly collected the exhaust gas. The emission factors of gasoline cars were corrected by considering the cold start and car life time. Using the Toxicity Equivalent Factor of PAHs against benzo[a]pyrene, the benzo[a]pyrene emission factor became 660 ng km-1 for gasoline car and 1700 ng km-1 for diesel car. To easily evaluate the concentrations at the roadsides and crossroads, regression equations were introduced as the functions of building height, road width, and wind speed from CFD simulations. Benzo[a]pyrene concentrations at the roadsides and crossroads in Osaka City were calculated by using the traffic volume, measured emission factors, and the regression equations. The average benzo[a]pyrene concentration calculated at the roadsides and crossroads was 0.63 ng m -3 and 1.96 ng m-3 respectively, which exceeded the screening level for 10-5 person. These results suggest that the atmospheric environmental standard of benzo[a]pyrene in Osaka City should be regulated as soon as possible.
Screening technique to estimate high benzo[a]pyrene concentrations near roads
Screening-Verfahren für die Schätzung der Benzopyrenkonzentrationen an Straßen
2012
10 Seiten, 7 Bilder, 2 Tabellen, 19 Quellen
Conference paper
English
Benzo (a) pyrene emissions from gasoline and Diesel automobiles
Automotive engineering | 1979
|Benzo (a) pyrene Emissions from Gasoline and Diesel Automobiles
SAE Technical Papers | 1979
|Engineering Index Backfile | 1896
Neural networks to estimate pollutant levels in canyon roads
British Library Conference Proceedings | 2001
|Application of Neural Networks to Estimate AADT on Low-Volume Roads
British Library Online Contents | 2001
|