Shanthi S, Nirmaladevi K , Pyingkodi M , Deepika K, Gobinath R. “Study Of Machine Learning Models For Air Quality Index Prediction ”. International Journal of Control and Automation, Vol. 13, no. 03, May 2020, pp. 203-8, http://sersc.org/journals/index.php/IJCA/article/view/24987.