The use of reflective material in roofing could help Fresno, Calif., reduce its ozone levels and comply with the federal, one-hour standard, according to this article. Roofing materials with titanium oxide can help reflect sunlight and reduce heat, according to a research team at the Lawrence Berkeley National Laboratory. Installation of reflective roofs on houses in the city could save $60 million annually in energy costs, but the California Energy Code only requires cool roofs for commercial buildings.

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