Full formScience
UHIstands forUrban Heat Island
Full Form of UHI
What is UHI?
Urban Heat Island (UHI) refers to a phenomenon where urban or metropolitan areas experience significantly higher temperatures than their surrounding rural areas due to human activities and modified land surfaces. The effect is primarily caused by dense concrete structures, asphalt roads, reduced vegetation and water bodies, vehicular emissions, air conditioning heat discharge, and industrial activity that absorb solar radiation during the day and re-radiate it at night, preventing natural cooling. In India, UHI is a major environmental and public health concern as metropolitan cities like Delhi, Mumbai, Ahmedabad, Chennai, Bengaluru, and Hyderabad frequently record surface temperatures three to six degrees higher than nearby rural zones, intensifying heatwave conditions and increasing heatstroke-related deaths among outdoor workers and the elderly. The India Meteorological Department, the National Disaster Management Authority, and various smart city missions actively monitor UHI intensity through satellite-based thermal imaging and ground weather stations. Mitigation strategies include rooftop gardens, cool pavements, urban tree cover, and blue-green infrastructure. The concept forms an important topic in the General Studies paper of UPSC, SSC, and state PSC examinations, particularly under climate change adaptation, sustainable urban planning, and environmental governance.
UHI का फुल फॉर्म
शहरी ऊष्मा द्वीप
Example
The IMD recently warned that Delhi's urban heat island effect is pushing night-time temperatures up to 5 degrees higher than neighbouring rural Haryana, worsening the ongoing heatwave.
UHI — frequently asked questions
What is the full form of UHI?
UHI stands for Urban Heat Island, a phenomenon where city areas become noticeably warmer than the surrounding countryside.
Why are Indian cities hotter than nearby villages?
Indian cities trap heat due to concrete buildings, asphalt roads, vehicular pollution, and loss of green cover, which together create the Urban Heat Island effect.
Which Indian cities are most affected by UHI?
Delhi, Mumbai, Ahmedabad, Chennai, Bengaluru, and Hyderabad are among the most UHI-affected metropolitan cities in India.