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| 1918 || {{w|Influenza}} || || During the {{w|1918 flu pandemic}}, the {{w|Red Cross}} encourages women to sew masks.<ref name="sideeffectspublicmedia.orgu">{{cite web |title=COVID-19 Mask Makers Are Part Of A Larger History |url=https://www.sideeffectspublicmedia.org/post/covid-19-mask-makers-are-part-larger-history |website=sideeffectspublicmedia.org |accessdate=17 September 2020}}</ref> || || [[File:Spanish flu in 1918, Police officers in masks, Seattle Police Department detail, from- 165-WW-269B-25-police-l (cropped).jpg|thumb|center|200px|Seattle police wearing masks in December 1918]]
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| 1918 || {{w|Influenza}} || || {{w|Anti-Mask League of San Francisco}} || {{w|United States}} || [[File:Detail, Co-op Cafeteria detail, Colleges and Universities - University of California - University of California, Berkeley, California. Open air barber shop during influenza epidemic - NARA - 26428662 (cropped).jpg|thumb|center|200px150px|Barbers wearing masks during the epidemic]]
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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}}
