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FILE PHOTO: A truck engine is tested for pollution near
FILE PHOTO: A truck engine is tested for pollution exiting its exhaust pipe near the Mexican-U.S. border in Otay Mesa, California September 10, 2013. REUTERS/Mike Blake/File Photo
FILE PHOTO: A truck engine is tested for pollution exiting its exhaust pipe near the Mexican-U.S. border in Otay Mesa, California September 10, 2013. REUTERS/Mike Blake/File Photo