The epidemiological studies on the association between daily PM10 concentrations and short-term mortality in Bangkok found the similar estimate that 1 μg/m3 increase in PM10 resulting in 0.10% increase in daily mortality [8,9].
This study was designed to assess the level of PM10 and PM2.5 at the main connection roads inside the city of Nakhon Si Thammarat where local people is experiencing the deterioration of air quality due to increasing traffic density and, hence possibility of health impacts.