Namcome, Teerawat, and Roengchai Tansuchat. 2021. “The Impact of Fine Particulate Matter (PM 2.5) Pollution on the Number of Foreign Tourists in Chiang Mai and Bangkok”. Community and Social Development Journal 22 (3). Chiang Mai, Thailand:19-35. https://doi.org/10.14456/rcmrj.2021.247437.