A woman wears a face mask in the part of the city near neighbourhoods known for burning coal for heating in Ulaanbaatar, Mongolia January 26, 2017. Not many people in Ulaanbaatar wear masks to protect themselves against pollution. (Photo by B. Rentsendorj/Reuters)

A child plays with a mock submachine gun at a model Mass Transit Railway (MTR) station to mark the National Security Education Day at Hong Kong Police College in Hong Kong, China on April 15, 2021. The “education day” was organized to promote the sweeping legislation China imposed last year, marked with school activities, games and shows, and a parade by police and other services. (Photo by Tyrone Siu/Reuters)

A man wearing a mask looks on as he sells matresses in Manila, Philippines, January 8, 2020. (Photo by Willy Kurniawan/Reuters)

Employees wear "No-Face" masks during working hours at a service company in Handan, Hebei Province of China. As a service company, staff must smile to customers every day. On “No-Face Day”, staff wore masks to hide their facial expressions and allow them to relax. No-Face is a character in the 2001 animated movie “Spirited Away”, a silent masked creature who has no facial expressions.

Harris & Ewing Inc. photographed people, events, and architecture, particularly in Washington, D.C., during the period 1905-1945. Photo: Tests of Curtiss Palne for Army, Single Control. Created by Harris & Ewing. Published in 1912.

A dragon mask for the upcoming Lunar New Year hangs on the wall at Lily Hambali's and lion masks and custome maker in Bogor, Indonesia, 02 February 2015. The Chinese Lunar New Year, known here as Imlek, is only three weeks away. The whole city is getting decked out to celebrate the event on 19 February 2015. (Photo by Adi Weda/EPA)

Jerome Holcomb of Birmingham, Ala., posses for a photo atop a longhorn steer at the Fort Worth Stockyards Thursday, March 11, 2021, in Fort Worth, Texas. The mask mandate to prevent the spread of COVID-19 has been cancelled in Texas. Holcomb said he was tired of wearing a face mask so he came to visit Fort Worth after the Alabama governor extended the mask mandate in his home state. (Photo by L.M. Otero/AP Photo)

Members of the Indian Army display aerobatic Taekwondo skills during the 11th Reunion and 262nd Anniversary of Army Service Crops in Bangalore, India, 09 December 2022. The 11th ASC Reunion & 262nd Corps Day will be held at Army Service Corps (ASC) Centre & College on 8th and 9th of December 2022, to showcase the military capabilities. Indian Army Service Corps, established in 1760, is an arm of the Indian Army handling logistic support. (Photo by Jagadeesh N.V./EPA/EFE/Rex Features/Shutterstock)