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. 2017 Apr 11;7:45956. doi: 10.1038/srep45956

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Modelled HNO₃ annual mean concentration, (a) 2007; (b) 2014. (c) Variation of HNO₃ levels in 2014 with respect to 2007. Figure created by the authors using ArcGis 10 (http://www.esri.com/software/arcgis/arcgis-for-desktop).