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. 2016 Sep 29;6:34408. doi: 10.1038/srep34408

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Copyright © 2016, 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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The USTC’s OMI tropospheric NO₂ products were used here. The red outline represents Beijing city, and the red five-pointed star indicates the MAX-DOAS observation site at Beijing urban area (40°N, 116°22′48″E). This figure was generate by IDL 8.2 (http://www.esrichina.com.cn).