A good quality of indoor environment (dwellings, workplaces, schools, day care centers, bars, and discotheques) is a very important environment and health target, in so far as subjects in industrialized countries spend over 90% of their time indoors [1].
The quality of indoor environments depends on the quality of the atmospheric air that penetrates from outdoors and on the presence of indoor air pollution sources. Modern dwellings are often thermally insulated and have a low ventilation rate, to improve energy efficiency [1], but these aspects can deteriorate the indoor air quality. Indeed, pollutants are less diluted indoors than outdoors, possibly reaching higher concentrations. Moreover, the indoor environment is a result of the interaction between building system, construction techniques and materials, contaminant sources, and building occupants [2].