![A tourist wearing a face mask against air pollution takes a selfie on the Tian'anmen Square in heavy smog in Beijing, China, 18 November 2016. A red Stock Photo - Alamy A tourist wearing a face mask against air pollution takes a selfie on the Tian'anmen Square in heavy smog in Beijing, China, 18 November 2016. A red Stock Photo - Alamy](https://c8.alamy.com/comp/W8439K/a-tourist-wearing-a-face-mask-against-air-pollution-takes-a-selfie-on-the-tiananmen-square-in-heavy-smog-in-beijing-china-18-november-2016-a-red-W8439K.jpg)
A tourist wearing a face mask against air pollution takes a selfie on the Tian'anmen Square in heavy smog in Beijing, China, 18 November 2016. A red Stock Photo - Alamy
![A participant wearing a face mask with a No-Smog sign rides a horse during an anti-smog action art parade on the Foreigners Street in Chongqing, China Stock Photo - Alamy A participant wearing a face mask with a No-Smog sign rides a horse during an anti-smog action art parade on the Foreigners Street in Chongqing, China Stock Photo - Alamy](https://c8.alamy.com/comp/W90MN4/a-participant-wearing-a-face-mask-with-a-no-smog-sign-rides-a-horse-during-an-anti-smog-action-art-parade-on-the-foreigners-street-in-chongqing-china-W90MN4.jpg)
A participant wearing a face mask with a No-Smog sign rides a horse during an anti-smog action art parade on the Foreigners Street in Chongqing, China Stock Photo - Alamy
![Woman and man wearing sanitary mask outdoors in Da Lat city centre Vietnam. Medical mask protection against risk of chinese flu virus epidemy in Asia. Anti smog mask traffic pollution. - Travel Woman and man wearing sanitary mask outdoors in Da Lat city centre Vietnam. Medical mask protection against risk of chinese flu virus epidemy in Asia. Anti smog mask traffic pollution. - Travel](https://www.traveloffpath.com/wp-content/uploads/2021/09/Vietnam-During-COVID-19.jpg)
Woman and man wearing sanitary mask outdoors in Da Lat city centre Vietnam. Medical mask protection against risk of chinese flu virus epidemy in Asia. Anti smog mask traffic pollution. - Travel
![Groups push for standards on PM2.5 anti-smog masks amid concern over fakes | South China Morning Post Groups push for standards on PM2.5 anti-smog masks amid concern over fakes | South China Morning Post](https://cdn1.i-scmp.com/sites/default/files/2014/02/27/china-pollution_pek701.jpg)
Groups push for standards on PM2.5 anti-smog masks amid concern over fakes | South China Morning Post
![Pm2.5 Cotton Anti-Smog Mask Dustproof Mask with Removable Eye Mask + 2 Filters Personal Protective Device Made in China - China Face Mask, Mask | Made-in-China.com Pm2.5 Cotton Anti-Smog Mask Dustproof Mask with Removable Eye Mask + 2 Filters Personal Protective Device Made in China - China Face Mask, Mask | Made-in-China.com](https://image.made-in-china.com/44f3j00MOiTgJjayNom/Pm2-5-Cotton-Anti-Smog-Mask-Dustproof-Mask-with-Removable-Eye-Mask-2-Filters-Personal-Protective-Device-Made-in-China.jpg)
Pm2.5 Cotton Anti-Smog Mask Dustproof Mask with Removable Eye Mask + 2 Filters Personal Protective Device Made in China - China Face Mask, Mask | Made-in-China.com
![Girl Wearing Mouth Mask With Filter Against Air Pollution Beijing Stock Photo - Download Image Now - iStock Girl Wearing Mouth Mask With Filter Against Air Pollution Beijing Stock Photo - Download Image Now - iStock](https://media.istockphoto.com/id/503864176/photo/girl-wearing-mouth-mask-with-filter-against-air-pollution-beijing.jpg?s=612x612&w=0&k=20&c=oekY_n8QMBCupKVn1Ds_KCwR1jwbMwNOATmtWn9GXfw=)