WASHINGTON (Sputnik) — The Justice Department and the US Environmental Protection Agency (EPA) announced in the statement that MTU violated the 1990 Clean Air Act by selling 895 non-road heavy-duty diesel engines — which are used in mining, marine and power generation vehicles and equipment — without valid certificates of conformity. “Under the settlement, MTU will pay a $1.2 million penalty and perform annual audits of its engine emission testing and certification activities for three years,” the statement, issued on Tuesday, said.