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CIBSE guidence on acceptable CO2 levels!
June 2, 2015

CIBSE guidence on acceptable CO2 levels!

The levels of CO2 can tell us how good is the indoor air quality. CIBSE ( has set some guidance levels for acceptable CO2 levels.

  • Fresh: 600 ppm
  • A little close: 800 ppm (equivalent to around 10 l/s per person ventilation rate)
  • Close: 1,00 ppm (equivalent to around 8 l/s per person ventilation rate and the standard target ventilation)
  • Very close: 1,200 ppm
  • Very bad: 1,300 ppm


One Response

  1. Mark Murphy says:

    It is nice to see the levels, but the reference should point to a document that one can refer to…