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| 1919 || || || The {{w|United States Bureau of Mines}} initiates the first respirator certification program, and certifies the first respirator.<ref name="cdc.govi">{{cite web |title=100 Years of Respiratory Protection History |url=https://www.cdc.gov/niosh/npptl/Respiratory-Protection-history.html |website=cdc.gov |accessdate=17 September 2020}}</ref> || {{w|United States}}
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| 1919 || || || By the end of the {{w|1918 flu pandemic}}, most scientists and health commissions come to a consensus about the benefits of wearing masks.<ref name="fastcompany.comss">{{cite web |title=A brief history of people refusing to wear masks |url=https://www.fastcompany.com/90500617/a-brief-history-of-people-refusing-to-wear-masks |website=fastcompany.com |accessdate=17 September 2020}}</ref> |||| [[File:1919FluVictimsTokyo.jpg|thumb|center|200px|1919 Tokyo, Japan]]
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| 1920 || || || The use of masks becomes routine practice in the operating room.<ref name="Aschenbrenner"/> ||
