A number of epidemiological studies had been conducted worldwide [5-10] and in Thailand[6-9] to investigate effects of PM on human health, particularly for risk people, i.e. schoolchildren. A 10 μg/m3 increase in PM10 may lead to excess health risk by around 1% of
mortality [6,7]. From our study, school children at Lak Muang Connection, Nakhon Si
Thammarat faced more than 1% of excess risk for mortality. To minimize the potential health
impacts, we recommended that appropriate policies and measures should be provided in
place to tackle the potential PM air quality problems. Including proper traffic management, particularly during dropping off/picking up students at the schools (morning/evening hours) may cut off the significant PM levels and hence reduce health burdens. Permanent air quality monitoring stations would be also considered to install at urban area of Nakhon Si Thammarat for air pollutants surveillance.
ภาพ Figure 3. Temporal variation of 24-hour average PM10: (a) During semester break and (b) During semester