Whenever the emission rate Q (m3/h) of any 'contaminating' substance of the indoor air (CO2, water vapour, other substances) is given, the asymptotic ('after a long period of time') equilibrium concentration (dimensionless) of this substance is:

where Camb is the (dimensionless) concentration of the contaminant in the ambient air and V means the indoor air volume of the considered building. has to be compared with the desired or just allowed value (in Germany: MAK - value = maximum allowed concentration at working place).

If the concentration of the diluted matter is given as a mass concentration p (in kg/m3), the corresponding final value of it is:

where pamb (in kg/m3) is the mass concentration of the contaminant in the ambient air and S (in kg/h) is the local source strength within the room.

Corresponding values of air change rates are given for every kind of room as the maximum of the:

• required air supply, which depends on the number of individuals present (typically about 30 m3/h per person);

• recommended volume rates of exhaust air for several functional rooms; and

• minimum air exchange rate of n = 0.3 h-1, which accounts for indoor air pollution without any persons or functional activity; this value considers the fact that indoor equipment and appliances are permanently releasing gaseous matter, which contaminates the indoor air and has to be removed by dilution with fresh air.

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