The result of the summer warming trends that keep surfaces extremely warm. Dark materials absorb more heat from the sun. Black surfaces in the sun can be up to 70°F (40°C) hotter than the most reflective white surfaces. If those dark surfaces are roofs, some of the heat collected by the roof is transferred inside, thus creating unwanted heat. Landscape design, vegetation, and alternative roof, and paving materials can all help with the heat island effect.[ix

This phenomenon describes urban and suburban temperatures that are 2° to 10°F (1° to 6°C) warmer than nearby rural areas. For more information, visit www.epa.gov/heatisland/.

A dome of elevated temperatures over an urban area caused by the heat absorbed by structures and pavement.