It has long been known that cities are hotter than the surrounding countryside. Roads and buildings absorb and retain more heat than soil and vegetation. For centuries the technique of uchimizu has been used in Japan to cool down that urban heat: uchimizu is the simple old Japanese tradition of water sprinkling. That uchimizu indeed is an effective way of reducing extreme heat in cities – it also works well against dust by the way - has been shown by Delft researcher Anna Solcerova and colleagues.

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