Airborne spread of Covid-19 shows the need to purify the indoor air.

https://www.docjon.org/post/the-evidence-for-airborne-transmission-of-covid-19-and-why-who-cdc-and-phe-advice-should-change

In the mind of scientists working on this, there’s absolutely no doubt that the virus spreads in the air……This is a no-brainer…… We have already lost valuable time by ignoring this method of spread and we should act on the presumption that COVID-19 is spreading on the air. »

2 April 2020; Professor Lidia Morawska, International Laboratory for Air Quality and Health (ILAQH), School of Earth of Atmospheric Sciences, Queensland University of Technology, Brisbane, Australia https://www.nature.com/articles/d41586-020-00974-w

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