2024 Volume 13 Issue 1 Pages 28-34
Air pollution is one of the biggest problems in many cities worldwide. Chiang Mai is a city that also faces this problem, especially during the dry season. Due to its topography, Chiang Mai has various elevation areas, resulting in the dispersion of pollution at different altitude locations that should be measured in order to evaluate health hazards at different locations. In this study, the concentrations of PM2.5 and PM10 were measured at different altitudes in Chiang Mai, Thailand. At the same time, the ambient dose equivalent rate was monitored. The measurement results showed that the average concentration of PM2.5 and PM10 around urban areas was 23±13 µg m-3 and 47±18 µg m-3, respectively, and was 14±9 µg m-3 and 29±14 µg m-3, respectively, around outside urban areas. Moreover, a minor effect of altitude was observed from the measurement locations outside urban areas. The PM2.5 and PM10 concentrations tend to increase with increasing altitude. However, there was no significant difference in ambient dose equivalent rates at different altitudes. The average ambient dose equivalent rate in this study was observed at about 95±12 nSv h-1.
