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ǰǰ At first, we expected all parameter correlates with the exposure to air pollution. Although of
descending branch of right pulmonary artery demonstrated significant correlation, the result showed no
relationship with age-CT ratio.ǰ
ǰǰ As we previously knew, air pollution such as nvPM from aircraft business and evaporation of

chlorine under poor architectural design with hot climate may damage lungs. We separated age group and
this study showed significant increase of diameter of descending branch of right pulmonary artery as
compared to unexposed controlled group, but no significant of CT ratio was found. ǰ

ǰǰ To correct building design, researcher advise to put more temperature control system. Building
should not allow high temperature at the room of chlorine water mixing. Moreover, shielding shall be
placed on water tank opening to decrease chlorine vapor spreading into the room where worker stay.

In conclusion, working in incompetent architectural design in a tropical climate in this study which
are no temperature control, no evaporation control and exposure of worker during chlorine filling on the
top of water tank supported hypothesis of almost change in cardiovascular and respiratory system under

chest x-ray but almost of controlled group was quite younger than experimental group which could be the
cause of error. However, more research may need to be performed to identified the exact cause of
abnormality in chest x-ray.

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