Credit: Oppressive heat and high humidity settle in over the Washington skyline as record-breaking temperatures and ozone-laden haze prompt air-quality alerts for the coming days in the nation's capital, Friday, July 23, 2010. Viewed from an overlook in Virginia above the Potomac River are, from left to right, the Lincoln Memorial, Washington Monument, the Capitol, the Smithsonian Castle and the Library of Congress. (AP Photo/J. Scott Applewhite)

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