Abstract
We conducted the comparative evaluation of the thermal environment between bare and grass ground located in a typical residential area. As a result, it was confirmed that the grass area is cooler than the neighboring residential area from 0.3 to 0.5 degrees Celsius in the night, and the effect of cooling is spread out about 100m. Concerning about the ground surface temperature, the grass ground is cooler than the bare ground through the night and day. But in the grass area, affected by an adjacent high-rise building, wind speed was weak and air temperature was high in the daytime. So, to mitigate the local thermal environment, it is important to care not only kinds of surface but also the local ventilation.
