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. 2019 Jan 22;191(2):94. doi: 10.1007/s10661-019-7231-8

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© The Author(s) 2019

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. 7 — Time variation plots of NO₂ concentrations (ppb) from nine sensors from October 2016 to September 2017 (readings from one sensor, NO₂_1 were excluded due to missing and erroneous data)