Germany - Indoor Air Quality Guidelines (translated via Google Translate):
Carbon dioxide concentration in indoor air
This is the carbon dioxide (CO2) concentration in indoor air central criterion for good or appropriate indoor air quality
classrooms. Compliance with defined target or maximum values
The CO2 concentration can also be used as an indicator for compliance with other air quality guidelines, e.g. for volatile organic substances compounds (VOC) and other substances.
A CO2 concentration applies as a guideline for all types of educational institutions of the indoor air as an average of 1,000 ppm over the duration of a unit of use (in schools, usually a school lesson).
Briefly increased instantaneous CO2 values of e.g. 1500ppm are acceptable if the average value is 1000ppm CO2 is maintained during the teaching unit.
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