R. Benchawattananon, W. Pimda, N.Thanawut,. “IMPACT OF AGRICULTURE ON AIR POLLUTION IN THE KHON KAEN URBAN AREA, THAILAND”. Design Engineering (July 19, 2021): 3902- 3909. Accessed May 3, 2024. http://thedesignengineering.com/index.php/DE/article/view/2817.