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Rolling coal


Rolling coal is the practice of modifying a diesel engine to increase the amount of fuel entering the engine in order to emit an under-aspirated sooty exhaust that visibly pollutes the air. It also may include the intentional removal of the particulate filter. Practitioners often additionally modify their vehicles by installing smoke switches and smoke stacks. Modifications to a vehicle to enable rolling coal may cost from $200 to $5,000.

Rolling coal is a form of conspicuous air pollution, for entertainment or for protest. Some drivers intentionally trigger coal rolling in the presence of hybrid vehicles (when it is nicknamed "Prius repellent") to taunt their drivers, who are perceived as being environmentally motivated in their vehicle choice. Coal rolling may also be triggered at foreign cars, bicyclists and pedestrians. Practitoners cite "American freedom" and "a stand against rampant environmentalism" as reasons for coal rolling.

Health risks associated with rolling coal include respiratory issues. The American Cancer Society has linked exposure to diesel exhaust to lung cancer. A more actionable concern is road traffic safety violation, as the black smoke can intentionally impair visibility, risking motor vehicle crashes.

In July 2014, the United States Environmental Protection Agency stated that the practice was illegal, as it violated the Clean Air Act which prohibits the manufacturing, sale, and installation "of a part for a motor vehicle that bypasses, defeats, or renders inoperative any emission control device [and] prohibits anyone from tampering with an emission control device on a motor vehicle by removing it or making it inoperable prior to or after the sale or delivery to the buyer." In March 2015, Illinois General Assembly representative Will Guzzardi published a bill proposing to impose a $5,000 fine on anyone who removes or alters their vehicle's EPA emissions equipment. Guzzardi has made it clear that "The fine would come on top of any penalties enforced by the current law that prohibits emissions tampering."


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