An environmental group is suing four men who are on the Discovery Channel's "Diesel Brothers" show.

The lawsuit from Utah Physicians for a Healthy Environment says the men made illegal modifications to trucks and exceeded pollution limits.

Utah Physicians executive director Denni Cawley told the Salt Lake Tribune that the group is concerned about pollution from modified diesel vehicles.

Cawley said the Environmental Protection Agency has proposed classifying the Wasatch Front as failing to meet federal standards for air quality.

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The group wants to stop the men from modifying and selling emission control devices.

David W. Sparks, David Kiley, Joshua Stuart and Keaton Hoskins declined to comment.

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