Balasubramanian, A., C. N. Hari Prasath, K. Gobalakrishnan, and S. Radhakrishnan. “Air Pollution Tolerance Index (APTI) Assessment in Tree Species of Coimbatore Urban City, Tamil Nadu, India”. International Journal of Environment and Climate Change 8, no. 1 (March 10, 2018): 27-38. Accessed January 19, 2020. http://www.journalijecc.com/index.php/IJECC/article/view/27106.