This screenshot provided by the University of Houston taken November 3, 2012 shows a new app available for iPhones and Android smartphones. The Houston Ozone Map app collects data from 74 air and wind monitors throughout the Houston area, giving residents nearly real-time data on smog. (AP Photo, University of Houston)

Associated Press
This screenshot provided by the University of Houston taken November 3, 2012 shows a new app available for iPhones and Android smartphones. The Houston Ozone Map app collects data from 74 air and wind monitors throughout the Houston area, giving residents nearly real-time data on smog. (AP Photo, University of Houston)
This screenshot provided by the University of Houston taken November 3, 2012 shows a new app available for iPhones and Android smartphones. The Houston Ozone Map app collects data from 74 air and wind monitors throughout the Houston area, giving residents nearly real-time data on smog. (AP Photo, University of Houston)
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