Why do some cities experience urban heat islands?
Quick Answer
Buildings, roads, and dark surfaces absorb and store more heat than vegetation does. Dense development also reduces shade and evapotranspiration, making cities warmer than nearby rural areas.
The Full Story
Urban materials such as asphalt and concrete have lower reflectivity and higher heat storage than many natural surfaces. They absorb sunlight during the day and release that heat slowly at night, keeping city temperatures elevated. Trees and soil cool the air through shade and evaporation, but built-up areas usually have less vegetation and less moisture. The result is the urban heat island effect, which can make a city several degrees warmer than its surroundings, especially at night.
Key Facts
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Suggested video title for this topic:
"Why can a city feel like a furnace after sunset?"
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