Since the cost of energy is increasing sharply a trend to conserve energy in the indoor environment and in addition to improvements in thermal insulation, two possible solutions are adopted. The first one is to provide reduced air gaps and opening for newly constructed buildings to minimise the infiltration of outdoor air. The second one is to reduce the ventilation rate or the fresh air supplied in air conditioned buildings. These two solutions are the reason for some serious problems of indoor air quality. Many indoor air contaminants have reached levels which are unacceptable to the occupants and the body odour generated by the occupants forms one of the earliest indoor air contaminants
Study on the indoor air quality.
Germany, Stuttgart, Fraunhofer Institut fuer Bauphysik, 1993, proceeding, International Symposium Energy Efficient Buildings, Leinfelden - Echterdingen, Germany, March 9-11, 1993.