What Should CO2 Levels Be Indoors? 600 to 1,000 ppm
What Should CO2 Levels Be Indoors? 600 to 1,000 ppm

Indoor CO2 normally reads 600 to 1,000 ppm against 430 ppm outdoors. What raises it, how to bring it down, and why ASHRAE sets no 1,000 ppm indoor limit.

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