2. MATERIAL AND METHODS
2.1 Study area and sampling location
Nakhon Si Thammarat is one of big provinces in the south of Thailand located around 800 kmfrom Bangkok, the capital city. Levels of PM concentrations were found to be close to the
NAAQS of Thailand and partially exceeded the WHO air quality guidelines [11]. To assess
the potential PM exposures for school children, sampling locations were set up at 2 locations:
primary and high schools at Lak Muang Connection (see Figure 1) where the location was
identified as high PM area due to traffic emissions [11].
ภาพ Primary school High school Lak Muang Connection