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| 2020 (April 15) || || {{w|Coronavirus disease 2019}} || Scientists claim having developed a {{w|biodegradable}} material for {{w|face mask}}s which is effective at removing particles smaller than 100 nanometres including viruses and has a high breathability.<ref>{{cite news |last1=Layt |first1=Stuart |title=Queensland researchers hit sweet spot with new mask material |url=https://www.brisbanetimes.com.au/national/queensland/queensland-researchers-hit-sweet-spot-with-new-mask-material-20200414-p54jr2.html |accessdate=22 August 2020 |work=Brisbane Times |date=14 April 2020 |language=en}}</ref><ref>{{cite web |last1=Technology (QUT) |first1=Queensland University of |title=New mask material can remove virus-size nanoparticles |url=https://www.qut.edu.au/news?id=161468 |website=QUT |accessdate=22 August 2020 |language=en}}</ref> || {{w|Australia}}
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| 2020 (April 22) || || || ""In order to limit A study by the risk U.S. {{w|National Academy of directly transmitting the virus via droplets projected when speaking, coughing or sneezing, Medicine}} recommends wearing an anti-projection mask covering the nose and mouth, designed to retain these sputters droplets projected when speaking, coughing or sneezing and stop them dispersing in the immediate environment, has been recommended in a recent paper of the National Academy of Medicine […] To be effective, the wearing of anti-projection masks should be widespread in the public space.”"<ref name="newseye.euv"/> ||{{w|United States}}
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| 2020 (April 27) || || || Face masks become mandatory for shopping and in public transportation in Germany.<ref name="Fangerau">{{cite journal |last1=Matuschek |first1=Christiane |last2=Moll |first2=Friedrich |last3=Fangerau |first3=Heiner |last4=Fischer |first4=Johannes C. |last5=Zänker |first5=Kurt |last6=van Griensven |first6=Martijn |last7=Schneider |first7=Marion |last8=Kindgen-Milles |first8=Detlef |last9=Knoefel |first9=Wolfram Trudo |last10=Lichtenberg |first10=Artur |last11=Tamaskovics |first11=Bálint |last12=Djiepmo-Njanang |first12=Freddy Joel |last13=Budach |first13=Wilfried |last14=Corradini |first14=Stefanie |last15=Häussinger |first15=Dieter |last16=Feldt |first16=Torsten |last17=Jensen |first17=Björn |last18=Pelka |first18=Rainer |last19=Orth |first19=Klaus |last20=Peiper |first20=Matthias |last21=Grebe |first21=Olaf |last22=Maas |first22=Kitti |last23=Bölke |first23=Edwin |last24=Haussmann |first24=Jan |title=The history and value of face masks |doi=10.1186/s40001-020-00423-4 |pmid=32576263 |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7309199/}}</ref> || {{w|Germany}}
