By defining “indoor environment”, will specify all the confined spaces of living and working, craft: home, leisure, labor and transportation. According to this criterion, is define the term indoor environment; enclosed or confined spaces of: housing, public and private offices, community structures (hospitals, schools, factorys, industries, hotels, banks, etc…), locations or environments for recreation and, or social (cinemas, bars, restaurants, shops, sports, etc…), also:public transport and, or private (car, train, air, ship, etc…).etc.