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. 2019 Sep 25;10:4370. doi: 10.1038/s41467-019-12338-8

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — Aerosol particle chemical composition. Measured and modelled particle chemical composition at the Station for Measuring Ecosystem-Atmosphere Relations II (SMEAR II) station for the periods 15–24 May 2013 and 15 April to 5 May 2014. Panel a shows the measured and modelled submicron organic aerosol (OA) mass concentrations. Shown are also the modelled Highly Oxygenated organic Molecule Secondary Organic Aerosol (HOM SOA) mass and the number of days the air masses have spent over land upwind SMEAR II. Panels b and c show the average measured and modelled non-refractory submicron particle chemical composition, respectively. SOA accounts for 56% and the primary organic aerosol (POA) for 19% of the modelled submicron particle mass concentration respectively. The POA mainly originates from small-scale wood combustion and road traffic