German aerosol scientists say these 6 indoor air guidelines will reduce COVID-19 spread

December 9th, 2020 |

Finally, experts are addressing the contagious elephant in the room: How to actually make indoor air safe in the age of the coronavirus. This week a top cohort of German scientists released surprisingly straight-forward indoor air guidelines to prevent COVID-19 spread. They are:

  • N95 masks. “They should be mandatory in many sectors, instead of the simple hygiene masks,” write the authors.
  • Window ventilation. The more, the better. It’s effective and cheap.
  • Exhaust ventilation systems. The air must be extracted upwards through an overhead exhaust suction, and appropriately filtered if recirculated. The group advises that these ventilation systems be installed immediately in places like classrooms, restaurants, hospitals, buses, and trains.
  • Air purification systems. The use of appropriate purifiers for the size and space are critical. Portable is fine.
  • CO2 monitoring. The results are proxy for how well ventilation is working. If CO2 levels are extremely low in buildings like museums, for example, reopening could be reasonable.
  • No fans. Ceiling fans recirculate air, likely keeping virus particles in the air for longer.

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