The U.S. Environmental Protection Agency is cracking down on diesel pollution from commercial trucks and buses in California. The agency has already issued one fine, and says more will follow. The EPA's actions have repercussions in the Inland Empire, where diesel trucks are pervasive amid the worst air quality of any other urban area in the state. Capital Public Radio's Ben Bradford reports.
U.S. EPA Goes After Diesel Pollution From Out-Of-State Trucks

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