Wet-bulb temperature of 32-35º C can be lethal as Chennai humidity rises
GS3Economy · S&T · Environment · Security· Nuclear & new energy technology· Prelims·
Climate change and thermal stress: a GS3 and Science & Technology case study on humidity and heat.
Why in news
The report highlights that a wet-bulb temperature of 32-35°C in Chennai can be lethal due to high humidity preventing sweat evaporation.
Background
A May 2022 study linked these conditions to the escalating climate crisis and heatwaves.
Facts for Prelims
- FactWet-bulb temperature of 32-35°C is identified as a lethal threshold for human survival.
- FactChennai recorded 70% absolute humidity and 60% relative humidity at 32°C on April 23.
- S&THigh humidity prevents sweat evaporation, leading to dangerous internal heat accumulation.
Prelims practice question
What was the recorded absolute humidity in Chennai at 32°C on April 23?
- (a)85%
- (b)70%
- (c)90%
- (d)80%
Show answer
Answer: (b) 70% — The note states that Chennai recorded 70% absolute humidity and 60% relative humidity at 32°C.
For Mains
Q. Discuss the physiological and climatic implications of rising wet-bulb temperatures in coastal Indian cities and suggest urban heat mitigation strategies.
Dimensions to cover in your answer
- Physiological threshold: Human body's inability to cool via evaporation at high humidity
- Urban heat island effect: Coastal humidity compounding inland heat stress
- Climate adaptation: Need for heat-resilient infrastructure in high-humidity zones
Keywords: wet-bulb temperature · relative humidity · climate crisis · heatwaves · thermal stress
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This note is generated automatically from SatyaDheesh's news feed and mapped to the UPSC CSE syllabus. Check facts against the original report or PIB before using them in an answer.