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In May 2009, Bangkok city had a big political protest. Burning rubber wheel was a method of protesting. The smoke spread out in several areas and dissipating through the building.
Methods
An indoor environmental quality (IEQ) survey after decried situation was conducted in 2 buildings of the hospital which located nearest the protest area. The following parameters were collected such as temperature, % of Relative humanity(RH), total volatile organic compound (TVOCs), carbon dioxide(CO2) , carbon monoxide (CO),Particulate matter and polycyclic aromatic hydrocarbon(PAHs). The temperature, % RH, CO2, CO and TVOCs were directly measured by Direct Sense TVOCs TG 502 Multi-Gas Photo-ionizing detection monitor. The inhalable and respirable dust were directly measured by direct reading Dust track. The PAHs were collected and analyzed by NIOSH method number 5506
Results
General environment was contaminated with soot. The average IEQ were as follow: temperature 31.76 oC, RH 65 %, TVOC 0.01 ppm, CO2 625 ppm, inhalable dust 21 ug/m3 and respirable dust 12 ug/m3. Four PAHs namely, naphthalene, acenaphthylene, acenaphthene and fluorine were found in building. The PAHs in the building was higher than outdoor. Base on this event, we recommended cleaning and ventilating all area before move patients to those buildings.
Discussion
The IEQ of the building located near fire could be a problem and risk to health. After the fire, re-opening of building and moving back of the resident should be concerned to IEQ. For resident safely, IEQ measurement is recommended to perform before re-move in to the buildings.