Much attention has been paid recently to new regulations under the Clean Air Act governing greenhouse gas emissions. However, EPA continues to pursue emissions violations with respect to other pollutants that it has regulated for decades, such as nitrous oxides and particulate matter. EPA has focused its enforcement in this regard on imports of “non-road” mobile sources, which include a wide variety of diesel and gas-powered engines, vehicles and equipment, such as chainsaws, weed trimmers, dirt bikes, marine vessels and large industrial forklifts and bulldozers....
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