SALT LAKE CITY — A federal judge has ordered Diesel Power Gear, known for its Discovery Channel show “Diesel Brothers,” to pay about $850,000 in penalties for violating clean air standards.

U.S. District Judge Robert Shelby also prohibited the Woods Cross business from removing or dismantling emission controls, and from selling parts that counteract them.

The Friday order comes in response to a lawsuit filed by environmental advocates. It follows his finding roughly a year ago that Diesel Power illegally removed pollution control equipment and installed emission control defeat parts in diesel trucks, including several it sold.

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Utah Physicians for a Healthy Environment sued the business in 2017, arguing it harmed air quality along the Wasatch Front, contributing to its sooty wintertime air and ozone pollution in summer.

“The violations were numerous, occurred over a long period of time, significantly increased the toxic pollutants emitted by diesel trucks, and pose a serious risk to human health,” Shelby wrote.

Utah Physicians for a Healthy Environment, which sued the business, cheered the judge’s order.

“Illegally stripped down and modified diesel trucks have no place on our roadways,” the group’s president, Brian Moench, said in a prepared statement. “Any business that not only profits from doing that, but glorifies the plumes of pollution that their handiwork produces, should be held accountable, and that’s what this ruling does.” 

Shelby found Utah Physicians is also entitled to recoup attorney fees and gave the organization about 30 days to seek repayment in court filings.

Diesel Power has said the lawsuit involved 17 so-called concept trucks, many of which remained at the company store and hadn’t ever been driven.