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. 2021 Jul 24;19(6):4063–4073. doi: 10.1007/s10311-021-01285-w

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© The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 6 — (a) Ulaanbaatar, the capital of Mongolia, appeared in a sandstorm in April 2019. About 45% of the country’s population live in Ulaanbaatar and surrounding areas. The city experienced recurring and severe sandstorms in recent years.

Source: News.mn (Ankhtuya 2019). (b) A ger district on the outskirts of Ulaanbaatar. Many of those who now live in the ger district are former herders. Most ger districts are not connected to public water supplies or sanitary systems. Source: Dan Chung of The Guardian (Chung 2021)