![A protester with a gas mask during the protest.Dozens of demonstrators protested at the Landmark shopping mall in Central demanding for the Hong Kong government to close all the borders in Hong A protester with a gas mask during the protest.Dozens of demonstrators protested at the Landmark shopping mall in Central demanding for the Hong Kong government to close all the borders in Hong](https://c8.alamy.com/comp/2ATPJA1/a-protester-with-a-gas-mask-during-the-protestdozens-of-demonstrators-protested-at-the-landmark-shopping-mall-in-central-demanding-for-the-hong-kong-government-to-close-all-the-borders-in-hong-kong-connecting-with-mainland-china-in-order-to-control-the-deadly-corona-virus-from-spreading-into-hong-kong-2ATPJA1.jpg)
A protester with a gas mask during the protest.Dozens of demonstrators protested at the Landmark shopping mall in Central demanding for the Hong Kong government to close all the borders in Hong
![Gas masks, wooden shields, gardening gloves: How Venezuela's protesters are protecting themselves - The Washington Post Gas masks, wooden shields, gardening gloves: How Venezuela's protesters are protecting themselves - The Washington Post](http://www.washingtonpost.com/blogs/worldviews/files/2017/05/AP_17114827102514.jpg)
Gas masks, wooden shields, gardening gloves: How Venezuela's protesters are protecting themselves - The Washington Post
![A demonstrator wearing a gas mask protest during a summit on brown coal in Leuna, Germany, 27 February 2012. Experts from politics, science and economy meet to discuss on energetically significant usage A demonstrator wearing a gas mask protest during a summit on brown coal in Leuna, Germany, 27 February 2012. Experts from politics, science and economy meet to discuss on energetically significant usage](https://c8.alamy.com/comp/D6H1M4/a-demonstrator-wearing-a-gas-mask-protest-during-a-summit-on-brown-D6H1M4.jpg)
A demonstrator wearing a gas mask protest during a summit on brown coal in Leuna, Germany, 27 February 2012. Experts from politics, science and economy meet to discuss on energetically significant usage
![File:A protester wearing breathing gas mask. Clashes between protesters and interior troops persist. Euromaidan Protests.jpg - Wikimedia Commons File:A protester wearing breathing gas mask. Clashes between protesters and interior troops persist. Euromaidan Protests.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/6/62/A_protester_wearing_breathing_gas_mask._Clashes_between_protesters_and_interior_troops_persist._Euromaidan_Protests.jpg)
File:A protester wearing breathing gas mask. Clashes between protesters and interior troops persist. Euromaidan Protests.jpg - Wikimedia Commons
![A demonstrator wears a gas mask as federal officers deploy tear gas during a Black Lives Matter … | Las Vegas Review-Journal A demonstrator wears a gas mask as federal officers deploy tear gas during a Black Lives Matter … | Las Vegas Review-Journal](https://www.reviewjournal.com/wp-content/uploads/2020/07/14024055_web1_14024055-8095421a561041179b927fabbb5ba149.jpg)
A demonstrator wears a gas mask as federal officers deploy tear gas during a Black Lives Matter … | Las Vegas Review-Journal
![Person Wearing Gas Mask Holding The Planet Stock Photo - Download Image Now - Climate, Protest, Climate Change - iStock Person Wearing Gas Mask Holding The Planet Stock Photo - Download Image Now - Climate, Protest, Climate Change - iStock](https://media.istockphoto.com/id/1204168594/photo/person-wearing-gas-mask-holding-the-planet.jpg?s=612x612&w=is&k=20&c=r4cPRgsWOW7NM0RG52P_KzjnSODzSlukskoV7a2OObM=)
Person Wearing Gas Mask Holding The Planet Stock Photo - Download Image Now - Climate, Protest, Climate Change - iStock
![CrimethInc. : A Demonstrator's Guide to Gas Masks and Goggles : Everything You Need to Know to Protect Your Eyes and Lungs from Gas and Projectiles CrimethInc. : A Demonstrator's Guide to Gas Masks and Goggles : Everything You Need to Know to Protect Your Eyes and Lungs from Gas and Projectiles](https://cdn.crimethinc.com/assets/articles/2020/09/02/8.jpg)
CrimethInc. : A Demonstrator's Guide to Gas Masks and Goggles : Everything You Need to Know to Protect Your Eyes and Lungs from Gas and Projectiles
![People from different culture and races protest on for no racism and equal rights - Demonstrators wearing People from different culture and races protest on for no racism and equal rights - Demonstrators wearing](https://as1.ftcdn.net/v2/jpg/03/59/18/32/1000_F_359183287_x585EHrFAkGruFLwwaHx6YOIGtdn0GZn.jpg)
People from different culture and races protest on for no racism and equal rights - Demonstrators wearing
![People from different culture and races protest for equal rights - Demonstrators wearing face and gas masks People from different culture and races protest for equal rights - Demonstrators wearing face and gas masks](https://as1.ftcdn.net/v2/jpg/03/59/18/32/1000_F_359183271_dLXOveTBd5oQYM22m5vatzL3WY68JTXm.jpg)