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 Abstract—The inhalation of fine particles (PM2.5) and nitrogen dioxide (NO2) has been associated with health problems. Incense burning is an important indoor source of these pollutants. This research aims to measure PM2.5 and NO2 emitted from incense burning in shrines on special occasions and during normal periods to assess the indoor air quality changes. PM2.5 samples were collected on Teflon filters using a mini volume air sampler set up inside the shrines, while NO2 samples were collected by tube type passive samplers, set up both indoors and outdoors. When special events were compared with normal occasions, the mean PM2.5 concentrations obtained from 8 and 24 hrs were significantly different (p

Dense clouds of smoke hang in the air over the Mae Hong Son province caused by intense forest fires is a significant source of air pollution which is the most hazardous to environment and public health, particularly during November to April each year. This study is aimed to exploit the energy potential of leaf litter from various plants in dipterocarp forest of Mae Hong Son Province. Five tree species with high IVI show the energy potential as follows: Shorea obtusa 4,950 Kcal/Kg, Dipterocarpus tuberculatus 4,679Kcal/Kg, Shorea siamensis 4690 Kcal/Kg, Dipterocarpus obtusifolius 4674 Kcal/Kg and Quercus kerrii 5137 Kcal/Kg. During the fire season there is an average of 449.58 tons of leaf litter per Rai (1600 m 2 ).We can collect these leaves and turn them into fuel which means reducing the percentage of air pollution and the amount of firewood the inhabitants gather for their use up to 86,400 tons per year.