Articles | Volume 16, issue 9
https://doi.org/10.5194/acp-16-5497-2016
https://doi.org/10.5194/acp-16-5497-2016
Research article
 | 
03 May 2016
Research article |  | 03 May 2016

Chemical and physical characterization of traffic particles in four different highway environments in the Helsinki metropolitan area

Joonas Enroth, Sanna Saarikoski, Jarkko Niemi, Anu Kousa, Irena Ježek, Griša Močnik, Samara Carbone, Heino Kuuluvainen, Topi Rönkkö, Risto Hillamo, and Liisa Pirjola

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Cited articles

Alföldy, B., Gieschaskiel, B., Hofmann, W., and Drossinos, Y.: Size-distribution dependent lung deposition of diesel exhaust particles, J. Aerosol Sci., 40, 652–663, 2009.
Arnold, F., Pirjola, L., Rönkkö, T., Reichl, U., Schlager, H., Lähde, T., Heikkilä, J., and Keskinen, J.: First on-line measurements of sulfuric acid gas in modern heavy duty diesel engine exhaust: Implications for nanoparticle formation, Environ. Sci. Technol., 46, 11227–11234, 2012.
Aurela, M., Saarikoski, S., Niemi, J. V., Canonaco, F., A. S. H., Frey, A., Carbone, S., Kousa, A., and Hillamo, R.: Chemical and source characterization of submicron particles at residential and traffic sites in the Helsinki Metropolitan area, Finland, Aerosol Air Qual. Res., 15, 1213–1226, 2015.
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This paper presents a comprehensive summary of roadside measurements using a mobile laboratory, equipped with state-of-the-art instrumentation. Pollution gradients were observed for particle number, black carbon, organics, some metals, and gases at four different highway environments. Flow dynamics appeared to be an important factor, however, at the most open site, condensation of semi-volatile organics was observed. The fleet average NO2 emission factor increased over the last decade.
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