Cooling Interventions and Pedestrian Comfort

Trees are best supported for pedestrian comfort. The passage says the tree-only block had lower pedestrian-level air temperature than the reflective-only block, even though its surface-temperature reduction was smaller. Pedestrian comfort depends more on air temperature at body level than on surface temperature underfoot. Reflective pavement reduced surface temperature by 1.4 °C but did not lower pedestrian-level air temperature as much, and it introduced glare and monthly cleaning. The combined block had the largest surface cooling at 3.0 °C, but that result includes both trees and reflective pavement, so it cannot be credited to trees alone. If the council's priority is pedestrian comfort, the tree-only evidence is the most direct support, while the combined treatment remains promising but confounded.

The strongest limitation is confounding: Block C received both trees and reflective pavement, so its 3.0 °C surface-temperature reduction cannot be attributed to trees alone. The city is citing a combined-treatment result as if it were a tree-only result. A second limitation is that the outcome was surface temperature, not pedestrian-level air temperature, and the passage says the tree-only block performed better on pedestrian-level air temperature despite a smaller surface effect. Third, the study covered only one summer and did not measure winter conditions or maintenance costs, so the result may not generalize across seasons or budgets. The city could reasonably fund a tree pilot, but it should not claim that the Block C result proves trees alone cause the 3.0 °C reduction.