New Delhi, May 21 -- North India including Delhi and NCR faced an uncomfortable sultry Tuesday which felt like an unrelenting furnace, making outdoor conditions tough. Alarmingly, a study by the Council on Energy Environment and Water (CEEW), also revealed that the number of very hot days are increasing in India, but the number of very warm nights is increasing even more posing health risks. The study said that Delhi, Maharashtra, Goa, Kerala, Gujarat, Rajasthan, Tamil Nadu, Andhra Pradesh, Madhya Pradesh and Uttar Pradesh are among the 10 States with the highest heat risk. It further found that about 57 per cent of Indian districts, home to 76 per cent of the country's population, are currently at high to very high risk from extreme heat...