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😷 I’ve been invited to join an international campaign to research the potential dangers in shops and indoor venues. In this mega THREAD, I will be using a CO2 meter to measure the Covid-19 risks that we all face #Thailand #COVIDisAirborne #โควิดแพร่ทางอากาศ #CovidCO2 #โควิดco2 
Measuring the virus in the air is not easy. But CO2 meters recognize exhaled air inside rooms and so is a good proxy for the aerosols that carry the virus. If it’s 1,500 ppm that means 1.5% of the air has been in someone else’s lungs. Today I tested CO2 in three shops.
The first lesson I learned today is that you should be very careful in a vehicle. Anything over 800 ppm is risky if you’re not alone. With recirculating turned on it was 1885 ppm. In a taxi, ask the driver to turn it off or open a window or two #CovidCO2 #โควิดco2 #WearAMask
