CO2 vs Cfm-based ventilation assesments - Advantages and disadvantages of two monitoring options

The Carbon dioxide (CO2) and cubic-feet-per-minute (cfm) based methods are used to verify the amount of outdoor-air ventilation being delivered to building occupants , and to check that the minimum ventilation required by ANSI/Ashrae standard 62 is being provided too. Data quality varies significantly between CO2 and cfm based ventilation assessments. In that paper the advantages and drawbacks of each method are discussed.