Main Article Content
In the present, people spent their life in office and residential buildings with 90% of their life. Thus indoor air quality was very important to health. Formaldehyde was one of air pollutions that found indoor air of buildings. Formaldehyde was classified carcinogen by the international organization in USA. Mostly, industrial of Thailand took formaldehyde change to urea-formaldehyde with 70%. Urea-formaldehyde was produced raw material to be furniture, decorated residential buildings. Factors of formaldehyde concentration were temperature and ventilation room, the high air temperature and no ventilation room. Therefore, people might be exposure formaldehyde indoor air from furniture. That should be awareness with route of entries, inhalation and contact.