In Depth

How to Cool Down Parks in Hot Cities

Researchers at Princeton University are devising ways to transform green spaces into outdoor cooling centers.

Photographer: Michael Marczewski for Bloomberg Businessweek

The drive to be outside, even in hot weather, is hard to overcome. People without air ­conditioning would be more likely to seek relief at their local park, ­according to Elie Bou-Zeid, a professor of civil and environmental ­engineering at Princeton, than at a government building where they can feel like climate refugees. “It’ll certainly be more pleasant to be in a park than in some indoor stadium where nobody wants to go,” he says. The scientists are combining inexpensive technologies, some novel, some already in use, that they plan to test first in New Jersey for deployment in hot spots like Phoenix.