1. Akolkari, A.B.: National air quality. www.cpcb.nic.in.
2. Ameer, S., Shah, M., Khan, A., Song, H., Maple, C., Islam, S., Asghar, M.: Comparative analysis of machine learning techniques for predicting air quality in smart cities. In: IEEE Access. p. 1 (2019). https://doi.org/10.1109/ACCESS.2019.2925082
3. Sathya, D., Anu, J., Divyadharshini, M.: Air pollution analysis using clustering algorithms. In: 2017 International Conference on Emerging trends in Engineering, Science and Sustainable Technology (ICETSST). ISSN: 2348 – 8387
4. Govender, P., Sivakumar, V.: Application of K-means and Hierarchical clustering techniques for analysis of air pollution: a review (1980–2019). Elsevier vol. 11, Issue no. 1 (2019)
5. Doreswamy, Ghoneim, O.A., Manjaunath, B.R.: Air pollution clustering using K-means algorithm in smart city. Int. J. Innov. Res. Comput. Commun. Eng. 3(7) (2015)