S. Lodoysamba, D. Shagjjamba, and G. Gerelmaa. “Characterization of PM2.5 and PM10-2.5 Air Pollution of Ulaanbaatar City”. Scientific Transaction of the National University of Mongolia. Physics, vol. 15, no. 309, Mar. 2022, pp. 1-4, doi:10.22353/physics.v15i309.251.