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Transport and small-scale burning of wood are the most significant sources of black carbon in the Helsinki region

Transport and small-scale burning of wood are the most significant sources of black carbon in the Helsinki region

The Finnish Meteorological Institute took part in a study establishing the levels and sources of black carbon in the Helsinki region.

Local differences were significant and the proportion of local sources in black carbon levels was especially significant.

Levels of black carbon were higher in a street canyon on Mäkelänkatu than in areas in the Helsinki region where low-rise buildings predominate. The share of transport-based emissions in black carbon content was very high (85%) in Mäkelänkatu, where black carbon levels rose on weekday rush-hours and declined at weekends regardless of the season. In areas with low-rise buildings the levels of black carbon were observed in the winter and in evenings, when regional small-scale burning of wood as a source of emissions increased. In wintertime nearly half of the black carbon measured in low-rise areas was from the burning of wood.

More information:

Aku Helin, Researcher, tel. 050 307 6414, aku.helin@fmi.fi

Hilkka Timonen, Researcher, tel. 050 380 2864, hilkka.timonen@fmi.fi

Helin, A., Niemi, J.V., Virkkula, A., Pirjola, L., Teinilä, K., Backman, J., Aurela, M., Saarikoski, S., Rönkkö, T., Asmi, E. & Timonen, H.: Characteristics and source apportionment of black carbon in the Helsinki metropolitan area, Finland, Atmospheric Environment, 190, 87–98, 2018.

https://doi.org/10.1016/j.atmosenv.2018.07.022


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