Mobile Particle and NO_x Emission Characterization at Helsinki Downtown: Comparison of Different Traffic Flow Areas
作者： Tero Lähde , Jarkko V. Niemi , Anu Kousa , Topi Rönkkö , Panu Karjalainen
DOI: 10.4209/AAQR.2013.10.0311
关键词:
摘要: A two weeks measurement campaign by a mobile laboratory van was performed at downtown Helsinki, Finland, in winter 2010. The characteristics of air pollutants such as fine particles the size ranges 7-40 nm (N_(p40)) and 40-1000 (N_(p1000)), black carbon (BC), particle mass (PM_(2.5)), well gaseous compounds NO, NO_2, NO_x, CO CO_2 were studied. statistical analysis showed that pollution conditions strongly depended on traffic flow area; therefore, street sections classified high areas (HTF1-HTF4), low (LTF1-LTF5), urban background (BG1-BG3). Large variation emissions observed, momentary peak concentrations 8 × 10^5 cm^(-3). At HTF exhaust followed clearly daily average heavy duty vehicle counts rather than counts. Higher correlation coefficients found between NO N_(tot). dispersion studies indicated improved from to areas. Therefore, proper city planning locating, for example, cycle tracks, schools hospitals farther busy streets might significantly reduce exposure risk humans.
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