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This paper measures the effect of trees’ canopy occupation on township street pedestrian thermal environment by ENVI-met software. The demonstration experiment was conducted in two streets with different features; street A (NE-WS) with 28% buildings coverage and 0.36 AR (street aspect ratios, H/W), street B (N-S) with 63.85% buildings coverage and 1.39 AR. The results show that trees’ canopy occupation ratio (TCR, V tc /V street ) influences the average temperature at pedestrian height. The average temperature increases in the morning, whereas it decreases at noon and in the afternoon. It seems that TCR needs an offset to work on wider street, such as in street A, where the average temperature drops when TCR is greater than 0.15 (noon case, 12:00) and greater than 0.05 (afternoon case, 16:00). For every 0.1 increase of TCR (V tc /V street ), the average temperature drops by 0.06°C(street A, 12:00), 0.118°C(street A, 16:00), 0.124°C(street B, 12:00), 0.1°C(street B), respectively. We can conclude that increasing the space occupation of trees’ canopy in the street can improve the pedestrian thermal environment, especially, the street with a small street aspect ratio. At the same time, we suggest that wider and taller trees shall be planted for street greening.

The impacts of trees’ canopy occupation on pedestrian thermal environment of township streets