In Japan, average air temperatures increased more than the global average due to climate change. In Tokyo, in addition to climate change, higher air temperatures are caused by the city's intense heat island, which causes changes in energy use and negatively affects human comfort in summer. In this thesis, we identified the main causes that strengthen the phenomenon of the urban heat island in Tokyo. We have highlighted several separate areas where the phenomenon is most intense and where measures are being taken against the phenomenon and its consequences. The Japanese Ministry of the Environment defines the custom of uchimizu as one such measure. The custom involves sprinkling water on the ground, and due to the evaporation of water, latent heat is then absorbed, which causes cooling of the surroundings. By analyzing the existing literature, we evaluated the impact of uchimizu and its modern versions on the microclimatic conditions of sprinkled areas and on the urban heat island of the 23 districts of the city of Tokyo. Sprinkling can reduce air and ground temperatures for a short time and increase the relative humidity of smaller areas. The impact on the occurrence of an urban heat island is limited. The effect of sprinkling on human comfort is much greater, since it significantly reduces the amount of heat that the human body receives from the surrounding area.
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