I have the same one. It serves as a proxy for determining ventilation rates. Ventilation is one of the best protections against COVID transmission, filtration being the other best.
Outdoor levels are typically around 450 ppm, and everything higher indoors is coming from exhalations. So if you’re in a space with other people, higher CO2 readings are essentially telling you you’re breathing other peoples’ breath. Some friends will leave meetings if the reading gets over 1400.
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