Ladakh has the cleanest air in India, followed by Arunachal Pradesh, Kerala, Andaman and Nicobar, and Puducherry, according to Energy Policy Institute at the University of Chicago's Air Quality Life Index. Tamil Nadu has been ranked 6th, followed by Goa, Nagaland, Karnataka and Dadra and Nagar Haveli. Delhi is most polluted in India, followed by UP, Bihar and Haryana.