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

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Fig. 1 — Locations of PM_2.5 concentrations data sites at Lahore, Karachi, Peshawar and Islamabad US consulates offices and COVID-19 cases distributions in Pakistan February 26 to June 30, 2020 (sources http://covid.gov.pk/stats/pakistan; Pakistan air quality monitoring US-EPA https://aqicn.org/).