Without it, the air in rooms heavily polluted by its occupants or by various pollutants (radioactive gas, Volatile Organic Compounds, formaldehyde, etc.) would be unbreathable.
Ouni dës ass d'Loft an de Stëmmen, déi schwer duerch seng Insassen pollutéiert ginn oder duerch verschidde Schuedstoffer (radioaktiver Gas, Volatile Organic Compounds, Formaldehyd, etc.) wären onwuelbar.