Coronavirus disease (COVID-19): Masks WHO, updated Jan 5 2022
Infection risk when using FFP3 respirators with valves or Powered Air Purifying Respirators (PAPRs) during surgical and invasive procedures NHS (UK), Aug 25 2021
classification explained
Was eine FFP2- von einer KN95-Maske unterscheidet SRF, Feb 5 2021 (Switzerland)
The US may soon have its first standards for consumer face masks. Are they strict enough? CNN, Feb 4 2021 label:ASTM
masks/respirators for free
Biden administration weighs plan to directly send masks to all Americans NBC, Feb 4 2021
articles re use in care homes / hospitals
Viele Corona-Fälle im Kreis Peine: Altenheim-Besuche nur noch mit FFP2-Maske HAZ, Jan 18 2021
articles re use in public transport, shops, businesses, etc
Some European Countries Move To Require Medical-Grade Masks In Public NPR, Jan 26 2021
Health authorities discouraging the use of respirators
EU-Agentur heizt Diskussion um FFP2-Maskenpflicht an Kurier, Feb 2 2021
Improvements, tips & tricks
It's Time To Up Your Mask Game NPR, Aug 12 2021
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