Wangchuk T, Lhendup T. Emission of Extremely High Concentrations of PM2.5 and Ultrafine Particles during Firewood Combustion. bjrd [Internet]. 2019 May 27 [cited 2024 Apr. 19];8(1):73-86. Available from: https://bjrd.rub.edu.bt/index.php/bjrd/article/view/45