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PhysOrg%3A Global Warming Causes More Bad Air Days: "A comprehensive new analysis by some of the nation%27s top medical experts projects that residents in more than a dozen U.S. cities will enjoy significantly fewer healthy air days in coming summers as hotter temperatures caused by global warming speed formation of the lung-damaging pollution commonly known as smog. That means more people will have to restrict outdoor activities%2C while those with asthma and other respiratory troubles face life-threatening results."