The use of CO2 as an indicator for indoor air quality and control of ventilation according to EN16798-1 and TR16798-2

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In many building regulations, the indoor air quality criteria is specified as an absolute level of CO2 concentration, being also the most common parameter used by demand controlled ventilation systems. The use is however challenged by new research showing that the CO2 as a source itself may influence cognitive performance of people. In the indoor environmental quality European standard, EN16798-1, different methods are listed for calculating the design ventilation rate. Nevertheless, they do not result in the same level of indoor air quality. One of the methods uses CO2 concentration as criteria and specifies different concentrations for different categories of indoor air quality (I-IV). The related technical report, TR16798-2, provides recommended CO2 concentrations for different types of spaces and shows how the use of gas phase air cleaning may reduce the required amount of ventilation for the same level of indoor air quality. The use of this technology will however result in an increase of the CO2 concentration. This paper discusses these issues and gives recommendations for future revision of the standard and guideline in relation to the use of CO2 as an indoor air quality indicator.
Original languageEnglish
Publication date2021
Number of pages4
Publication statusPublished - 2021
Event15th ROOMVENT Conference - Online
Duration: 15 Feb 202117 Feb 2021
Conference number: 15


Conference15th ROOMVENT Conference


  • Ventilation
  • CO2
  • Control
  • Standards
  • Indoor air quality


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