Natcha Nitinattrakul และ Pichnaree Lalitaporn. (2023) Study the change in air pollution after the COVID-19 outbreak in Thailand. <i>Engineering and Applied Science Research</i>, <i>50</i>(2), 137-148.Natcha Nitinattrakul และ Pichnaree Lalitaporn. "Study the change in air pollution after the COVID-19 outbreak in Thailand". Engineering and Applied Science Research 50 (2023):137-148.Natcha Nitinattrakul และ Pichnaree Lalitaporn. Study the change in air pollution after the COVID-19 outbreak in Thailand. Faculty of Engineering, Khon Kaen University:ม.ป.ท. 2023.