UV Parasol, Dry-Mist Spraying, and Street Trees as Tools for Heat Stress Mitigation

Ultra Violet (UV) parasols are a reasonable countermeasure against heat stress as they portable and inexpensive. This study compared the mitigation effect of UV parasol with that street trees dry-mist spraying on hot humid summer day in Japan. We observed meteorological elements calculated universal thermal climate index (UTCI) wet-bulb globe temperature (WBGT) under parasol, trees, spraying, direct sunlight. The UTCI WBGT were lower than those sunlight by 4.4 1.3°C, respectively, because decrease black caused reduced downward shortwave radiation. demonstrated heatstroke risk one level. was equal to or greater 75 % from perspective UTCI. 5.9 1.9°C, sunlight, resulting reduction In contrast, did not mitigate conditions moderate winds. Although results this obtained observations single day, comparison earlier studies confirms values representative days