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FILE - In this Dec. 17, 2010 file photo, trucks make their way on eastbound in Livermore, Calif. The World Health Organization’s cancer agency has determined that diesel exhaust causes cancer. It’s raised the status of diesel exhaust from “probable carcinogen” to carcinogen. That puts it in the same category as other known hazards such as asbestos, alcohol and ultraviolet radiation.

Ben Margot / (AP Photo)