Air quality monitoring system at few locations in Delhi also indicated high pollution levels in Delhi, at some locations which are even higher than National Ambient Air Quality Standards prescribed by Government of India, Central Pollution Control Board as seen the image here. “The daily travel trips are expected to explode from 15 million today to 25.3 million in 2020. If no further action is taken to radically improve public transport, walking and cycling, then Delhi by 2021 will gasp for breath, pay unacceptable fuel costs and spew warming gases like never before.” Says Ms. Anumita Roychowdhury, CSE. (The Hindu, June 7 2012). Recently Delhi was reported to have air pollution even higher than that recorded in Beijing. Delhi ranks 8th in the report of top 100 cities of world with worst air quality published by World Health Organization in 2011.