Hold your breath! Bad air days on the rise in Valley

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[Tim Hacker, Tribune]

Vehicle Emissions

Arizona Department of Environmental Quality vehicle emissions inspector Lou Grisham finishes performing a retest on a vehicle, Tuesday, June 14, 2011 in Phoenix. [Tim Hacker, Tribune]

Tim Hacker, Tribune

Vehicle Emissions

A tailpipe test is performed on vehicle at the Arizona Department of Environmental Quality's vehicle emissions inspection station in Phoenix Tuesday, June 14, 2011 in Phoenix. [Tim Hacker, Tribune]