Estimation and validation of PM sub(2) sub(.) sub(5)/PM sub(1) sub(0) exhaust and non-exhaust emission factors for practical street pollution modelling

In order to carry out efficient traffic and air quality management, validated models and PM emission estimates are needed. This paper compares current available emission factor estimates for PM sub(1) sub(0) and PM sub(2) sub(.) sub(5) from emission databases and different emission models, and valid...

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Published in:Atmospheric environment (1994) 2007-12, Vol.41 (40), p.9370-9385
Main Authors: Ketzel, M, Omstedt, G, Johansson, C, During, I, Pohjola, M, Oettl, D, Gidhagen, L, Wahlin, P, Lohmeyer, A, Haakana, M, Berkowicz, R
Format: Article
Language:English
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Summary:In order to carry out efficient traffic and air quality management, validated models and PM emission estimates are needed. This paper compares current available emission factor estimates for PM sub(1) sub(0) and PM sub(2) sub(.) sub(5) from emission databases and different emission models, and validates these against eight high quality street pollution measurements in Denmark, Sweden, Germany, Finland and Austria. The data sets show large variation of the PM concentration and emission factors with season and with location. Consistently at all roads the PM sub(1) sub(0) and PM sub(2) sub(.) sub(5) emission factors are lower in the summer month than the rest of the year. For example, PM sub(1) sub(0) emission factors are in average 5-45% lower during the month 6-10 compared to the annual average. The range of observed total emission factors (including non-exhaust emissions) for the different sites during summer conditions are 80-130mgkm super(-) super(1) for PM sub(1) sub(0), 30-60mgkm super(-) super(1) for PM sub(2) sub(.) sub(5) and 20-50mgkm super(-) super(1) for the exhaust emissions. We present two different strategies regarding modelling of PM emissions: (1) For Nordic conditions with strong seasonal variations due to studded tyres and the use of sand /salt as anti-skid treatment a time varying emission model is needed. An empirical model accounting for these Nordic conditions was previously developed in Sweden. (2) For other roads with a less pronounced seasonal variation (e.g. in Denmark, Germany, Austria) methods using a constant emission factor maybe appropriate. Two models are presented here. Further, we apply the different emission models to data sets outside the original countries. For example, we apply the ''Swedish'' model for two streets without studded tyre usage and the ''German'' model for Nordic data sets. The ''Swedish'' empirical model performs best for streets with studded tyre use, but was not able to improve the correlation versus measurements in comparison to using constant emission factors for the Danish side. The ''German'' method performed well for the streets without clear seasonal variation and reproduces the summer conditions for streets with pronounced seasonal variation. However, the seasonal variation of PM emission factors can be important even for countries not using studded tyres, e.g. in areas with cold weather and snow events using sand and de-icing materials. Here a constant emission factor probably will under-estimat
ISSN:1352-2310
DOI:10.1016/j.atmosenv.2007.09.005