Halting Coronavirus Spread in Indoor Public Spaces using Cheap CO2 Detectors to Measure Ventilation // Dec 30, 2020

Apart from vaccine rollouts, I am 100% confident that the absolute best way to eliminate the coronavirus and future pandemics (perhaps even more deadly) is to properly ventilate indoor public spaces. Indoor air quality is generally poor, and we have a simple way to determine how poor and virus dangerous it is. All we need is widespread adoption indoors of digital CO2 monitors. When the real-time CO2 level indoors is close to that of the outdoor air (420 ppm), we are fine indoors; risk of virus transmission is low.

When the indoor CO2 level rises past a threshold level (I suggest 800 ppm) then we know for certain that the ventilation is poor, and we are at increased risk of catching the virus even when we are wearing a mask. In a stuffy room with poor air circulation, the CO2 level can quickly rise to 1000 ppm, 1500 ppm, and even over 2000 ppm, and any virus particles in the room can stay in the air for many hours. A person with Covid in the room in the morning can easily cause any person in the room to catch the virus in the late afternoon, even with all parties wearing masks.

How do we ventilate rooms? Apart from having an excellent building circulation filtering system, opening/cracking windows to get cross ventilation is the next best way. For buildings with windows that do not open, I would take a glass drill bit and put a tiny hole in all the windows to save lives. It really is that simple. Small holes, and/or slightly open windows will ventilate with a minimal heat loss penalty in the winter.
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