1. Alhesnawi, A. S. M., Alsalman, I. M., & Najem, N. A. (2018). Evaluation of air pollution tolerance index of some plants species in Kerbala city, Iraq. Journal of Pharmaceutical Sciences and Research, 10, 1386–1390.
2. Barrs, H. D., & Weatherley, P. E. (1962). A re-examination of the relative turbidity technique for estimating water deficit in leaves. Australian Journal of Biological Sciences, 15(3), 413–442. https://doi.org/10.1071/BI9620413
3. Bhardwaj, B. M., & Singh, S. (2015). Air pollution tolerance of ornamental trees in an industrial city. HortFlora Research Spectrum, 4, 185–191.
4. Chaudhry, S., & Panwar, J. (2016). Evaluation of air pollution status and anticipated performance index of some tree species for green belt development in the holy city of Kurukshetra, India. International Journal for Innovative Research in Science & Technology, 2, 269–277.
5. Deepalakshmi, A. P. D., Ramakrishnaiah, H., Ramachandra, Y. L., & Radhika, R. N. (2013). Roadside plants as bio-indicators of urban air pollution. IOSR Journal of Environmental Science, Toxicology and Food Technology, 3(3), 10–14. https://doi.org/10.9790/2402-0331014