SUJIMAN, Sujiman. “Trends in Ambient Air Quality (NO2 and SO2) in Tenggarong City, Kutai Kartanegara District. East Kalimantan”. International Journal of Environmental, Sustainability, and Social Science 4, no. 5 (September 30, 2023): 1497–1504. Accessed June 6, 2026. https://staging.journalkeberlanjutan.com/index.php/ijesss/article/view/854.