A comprehensive new analysis by some of the nation’s 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, while those with asthma and other respiratory troubles face life-threatening results. The analysis was prepared by researchers at the Johns Hopkins University and Columbia University, in collaboration with researchers at Yale University, University at Albany-State University of New York, and University of Wisconsin-Madison. Results of the study, Heat Advisory: How Global Warming Causes More Bad Air Days, were published by NRDC (Natural Resources Defense Council)), and released in cooperation with Physicians for Social Responsibility’s health experts in more than a dozen cities. The study can be viewed at: //www.nrdc.org/globalWarming/heatadvisory/contents.asp