India, May 21 -- New Delhi

Delhi ranks among the highest heat-risk regions in the country, with 55% of its districts categorised "very high risk" and the rest "high risk", according to a report released by the Council on Energy, Environment and Water (CEEW) on Tuesday.

The study, which mapped heat risks across 734 districts in India, showed that six of Delhi's 11 districts-south-west, north-west, north, west, north-east, and Shahdara-face the highest risk. The research said a sharp rise in night-time temperature and humidity were key contributors.

"Delhi is recording six more 'very warm' nights each summer than it did in the past," the study said, pointing to a 9% spike in humidity levels since 2011. "It's not just about hotter days-ni...