Map Ta Put incident in 1997 was a well know environmental problem related to Volatile Organic Compounds (VOCs). In this incident, tens of student in a school nearly the Map Ta Put industrial estate were hospitalized due to serious air pollution. Source of the pollution was considered as VOCs. The school was closed and moved to another location. Source pollutants and source factory has not been identified yet. Even now there are various reports and claims regarding occurrence of fruit like smell (most likely aromatic VOCs), 40% of environmental complains are on odor and smell, and most of them are considered to be related to VOCs