For millions of Americans living in and around cities, heat islands
are of growing concern. This phenomenon describes urban and suburban
temperatures that are 2 to 10°F (1 to 6°C) hotter than nearby rural areas.
Elevated temperatures can impact communities by increasing peak
energy demand, air conditioning costs, air pollution levels, and
heat-related illness and mortality.

Fortunately, there are common-sense measures that communities can
take to reduce the negative effects of heat islands.