FILE-This July 15, 2014 file photo shows a custom-fitted research C-130 sits in a hanger being prepared for research flights, at Rocky Mountain Metropolitan Airport, in Broomfield, Colo. An intensive campaign to measure air pollution along Colorado's northern Front Range will produce a wealth of data to help identify the sources and levels of harmful ozone, researchers said Tuesday, Aug. 26, 2014. (AP Photo/Brennan Linsley,File)
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