CO2 sensors can 1) measure the indoor concentrations of CO2 and compare them against ASHRAE 62.1-2007 limits or, 2) measure the indoor concentrations of CO2 and compare them against outdoor CO2 concentrations. If you choose the second option, you will nee

CO2 sensors can 1) measure the indoor concentrations of CO₂ and compare them against ASHRAE 62.1-2007 limits or, 2) measure the indoor concentrations of CO₂ and compare them against outdoor CO₂ concentrations. If you choose the second option, you will need to install outdoor CO₂ monitors as well.

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CO2 sensors can 1) measure the indoor concentrations of CO2 and compare them against ASHRAE 62.1-2007 limits or, 2) measure the indoor concentrations of CO2 and compare them against outdoor CO2 concentrations. If you choose the second option, you will nee