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purpose of measuring indoor CO2 concentration?

Question: What is the purpose of measuring carbon dioxide in indoor air quality?

Answer: Carbon dioxide is an indicator substance for assessing the quality of indoor air in a place. A place with a high concentration of carbon dioxide may have poor indoor and outdoor ventilation, which is more likely to prevent other air pollutants from being diluted by fresh air or discharged outdoors. (Ministry of Education Environment and Disaster Prevention Education Division)

organic compound + O2 --------> CO2+ energy

As the number of people increases, the carbon dioxide content in the air will increase, and the relative oxygen content will decrease, especially in places with a large number of people per unit area, such as classrooms, theaters, small rooms or small ventilated spaces for friends. PM400 can measure O2, CO, CO2 air quality in room, kitchen, living room, office