Mätning av luftkvalitet vid TestSite E18

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Measurements of air quality (PM10 and NOx (NO and NO2)) were made during the period 2013-03-16 to 2014-03-26 at TestSite E18, situated along the E18 highway between Västerås and Enköping. At TestSite E18 continuous measurements of traffic (eastbound direction) and meteorology are made. On the site, optical equipment for measuring road wetness was used during the campaign. The main purpose of the surveys is to create a data base for a highway traffic environment, which can be used for modeling air quality and calculation of exposure and health effects at a later stage. The results show that the concentrations do not exceed the relevant EQS. PM10 and NO2 are highest during the spring and autumn and lower in the summer period. The correlations between PM10 and nitrogen oxides are high in spring, low in summer and moderate in autumn and winter, suggesting that the summertime sources for PM10 at TestSite E18 are essentially others than traffic. Road surface moisture reduces PM10 levels strongly during spring when road dust is a major particle source. On a daily basis nitrogen dioxide and PM10 concentrations follow traffic variation, but with a clear secondary minimum at midday for nitrogen oxides. TestSite E18 generates large amounts of traffic and meteorology data, which can be used to analyze the correlation between these factors and air pollution at the site, and provide appropriate data for input to as well as validation of emission models.

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