Wangchuk, T. . and Lhendup, T. . (2019) “Emission of Extremely High Concentrations of PM2.5 and Ultrafine Particles during Firewood Combustion”, Bhutan Journal of Research and Development , 8(1), pp. 73–86. Available at: https://bjrd.rub.edu.bt/index.php/bjrd/article/view/45 (Accessed: 20 April 2024).