Abstract
A risk of heat disorder was analyzed at three outdoor spaces (paved open space, densely buildings, and farm) by means of long-term measurements of WBGT (West-Bulb Globe Temperature). The number of days when WBGT of more than 31 degrees was recorded was 23 days in the paved space and 21 days in the farm while only 3 days in the densely buildings. From the comparison between heat disorder patients transported by ambulance and daily maximum WBGT values, it revealed that the day when daily maximum WBGT exceeded 30 degrees rapidly increased a risk of heat disorder. The exposed time of WBGT over 30 degrees also makes a greatly difference between paved open space/farm and densely buildings. At the densely buildings, building shade suppressed an increase of WBGT.
