Humagai, B. K. ., K. Adhikari, B. Pradhan, and T. . Yangzom. “Assessment of Ambient Particulate Matter Concentrations- PM10, PM2.5 and PM1 at Rinchending in Phuentsholing, Bhutan”. Bhutan Journal of Research and Development, Apr. 2022, doi:10.17102/bjrd.rub.10.2.019.