The quality of the indoor air is affected by various pollution sources and can be improved by controlling those sources and an effective ventilation. A major source of indoor air pollution are activities of building occupants (e.g cleaning products, paints, glues, perfumes) as well as emissions from construcion procucts and furnishings. Outdoor air pollution may also affect the indoor air quality in the classrooms.

Measurements of the indoor air environment can help identify some of the pollution sources as well as help the occupants to take actions to improve the indoor air quality to be healthier and perform better.