In this book, the authors have mapped the environmental phenomenon in the country and the need to develop optimal policies and technologies for creating sustainable, safe and secure air. The book chronicles how environmental education can contribute to urban sustainability. The authors have also analysed the sources and inspirations of green thought and given a voice to those furthering the development of a long-term healthy ecosystem. They have attempted to keep the text simple and limit the explanation to basic concepts so that the content can be understood by both beginners and professionals. I am of the opinion that smart cities should have a smart environment. This book discusses a range of measures to mitigate air pollution and create a smart environment for a healthy and breathable city. I have always been very supportive of ideas that promote an ecologically stable environment and have encouraged innovations that use natural resources to create provisions for future generations. Today, human activity is increasing at a pace that has never been seen in history. Developing countries are witnessing a faster rate of population growth, urbanization and economic development as compared to developed countries. Consequently, developing countries have had to deal with more serious environmental problems, including air pollution and other related issues, than developed countries. During my tenure in the Ministry of Environment and Forests, we had introduced fruitful schemes to reduce pollution in India, which included implementing various policies and legislations to promote clean air. The nation needs more initiatives like Swacch Bharat Abhiyan to further curb air degradation. I commend the authors for writing this book which can be of great help to pursue the dream of ‘Clean India’. I wish them all the best in their efforts to increase environmental awareness and support an ecologically balanced earth.