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. 2023 Jun 2;10(1):92. doi: 10.1186/s40537-023-00754-z

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© The Author(s) 2023

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — NO $_{2}$ temporal variation Temporal hourly and daily of the week NO $_{2}$ concentration from variations for the 19 stations from 2019 to 2020. The hourly concentration of NO $_{2}$ is highest in the early morning and lowest in the mid-afternoon. The station geo-location have an impact on the pollutant concentrates, the highest concentration found in the traffic area and lowers in the rural area