A Utah company that sold devices to remove emission controls on vehicles has agreed to pay $500,000 to settle claims by the Environmental Protection Agency that it violated the Clean Air Act.
The EPA says the illegal devices allow cars to spew smoke containing particulates linked with health problems, including respiratory disease and bronchitis.
Ogden-based Edge Products LLC sold more than of the 9,000 devices until 2011.
Federal officials say that added 158 tons of excess emissions in the atmosphere.
The settlement also requires Edge Products to offer to buy back the devices from anyone who purchased them and spend more than $150,000 on a project to offset air pollution.
The president of Edge Products did not return a message left by The Associated Press for comment.