We can't smell or taste or hear high levels of CO in indoor air. But with these monitors from the library, we can find out -
Hey, if I have six people breathing in my living room, and I crack two windows, the CO2 numbers are as low as if I had one person breathing in the room with the windows closed
Or
Hey, this grocery store's ventilation system copes a lot better with the crowd at 8 pm than the crowd at 6 pm
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