Temperatures remained above 45 degrees Celsius in large parts of Rajasthan, Haryana, Delhi, Chandigarh and Uttar Pradesh, affecting daily life as many chose to remain indoors in the afternoon. (Image/News18), Indian Meteorological Department defines a heatwave as an increase of 5-6 degrees above the normal temperature. (Image/News18), Heatwave remains over a region for several days up to several weeks. (Image/News18), Experts say outdoor workers, the elderly and children are at higher risk of heat exhaustion and heatstroke. (Image/News18), According to the World Health Organization, more than 1,66,000 (1.66 lakh) people died as a result of heat waves between 1998 and 2017. (Image/News180