FILE - In this Jan. 11, 2017, file photo, eEarly morning traffic is at a standstill on Interstate 5 headed into town as a semi truck and cars block the off ramp to Highway 217 above in Portland, Ore. A federal watchdog says the Trump administration moved to exempt a type of super-polluting cargo truck from clean air rules without conducting a federally mandated study on how it would impact public health. The report by the Environmental Protection Agency's inspector-general says agency officials cited a “wild West” atmosphere and “fast and loose” rulemaking at the agency under then-Administrator Scott Pruitt. (AP Photo/Don Ryan, File)
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