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. 2021 Jan 29;272:129809. doi: 10.1016/j.chemosphere.2021.129809

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Fig. 4 — Comparison of Tropospheric column of NO₂ (Sentinel 5P) over Lahore, Karachi, Peshawar and Islamabad during community interventions in 2020 versus March 22 to May 30, 2019 (http://www.tropomi.eu/data-products/nitrogen-dioxide).