Hottest among mega cities, Chennai faces increasing heat stress: study
“This summer was worse than ever” is a sentiment familiar to every resident of the city, either spoken out aloud or silently acknowledged every year between April and June. Supporting this observation, an analysis conducted by the Centre for Science and Environment (CSE) finds that Chennai not only stands out as the hottest mega city in India, but shows a threefold increase in days where the heat index (what the temperature feels like to the human body when relative humidity is combined with the air temperature) exceeds 41°C, marking the danger zone, over the past two decades. As a part of the study, the CSE compared summer temperatures from 2001 to 2011 with those from 2014 to 2023 in Delhi, Mumbai, Kolkata, Hyderabad, Bengaluru, and Chennai. The study finds that average relative humidity has significantly increased in the last 10 summers compared to the 2001-10 average, with the decadal summertime average ambient temperature rising by about 0.5°C in Chennai.
