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. 2022 Jun 23;311:119679. doi: 10.1016/j.envpol.2022.119679

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© 2022 The Authors

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 5 — Optimized locations of sampling for wastewater-based epidemiological (WBE) surveillance from urban and rural areas based on the observed SARS-CoV-2 viral RNA gene copies. No significant difference was observed in the four regions for isolation center and marketplace except for the ORF1ab genomic copies in the southern region.