Peter Klausch is an Engineer and Freelance Consultant at Arbejdsmiljoe Centret and part of his remit is to monitor CO2 levels. In rooms that do not produce their own carbon dioxide, the amount of CO2 in the air will be a product of the people in the room, how long they have been there, and any cigarette smoke (if indeed this is permissible). The carbon dioxide concentration remains stable if there is consistent ventilation in the room. The amount of CO2 is therefore a key indicator for whether the ventilation is sufficient or not. The carbon dioxide concentration can vary from about 350ppm outside, to 5000ppm in rooms with no ventilation. Carbon dioxide is measured to check whether the ventilation is sufficient for theroom compared to the number of people that are going to use it.

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