1. WHO, Ambient (outdoor) air pollution. https://www.who.int/news-room/fact-sheets/detail/ambient-(outdoor)-air-quality-and-health
2. Bernard, S., et al.: Dirty air: how India became the most polluted country on earth. (2019)
3. Want govt to build 1600 km green wall along Aravalli, Indian Express (2019)
4. OECD, The economic consequences of outdoor air pollution.: https://www.oecd.org/environment/indicators-modelling-outlooks/Policy-Highlights-Economic-consequences-of-outdoor-air-pollution-web.pdf
5. R. Sharma et al., An Online Low-Cost System for Air Quality Monitoring, Prediction, and Warning, in International Conference on Distributed Computing and Internet Technology, (Springer, Cham, 2020)