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. 2015 Oct 27;23:1158–1172. doi: 10.1007/s11356-015-5648-3

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© The Author(s) 2015

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 2 — Time series of monthly average concentrations of a NH₃, b NO₂, and c HNO₃ at the five sampling sites during 2011–2014. The annual average concentrations for the gases are shown in the boxes inside the corresponding figures