OIG finds EPA engine test slump delays truck NOx rule

EPA’s Office of Inspector General (OIG) in a new report finds that EPA testing of engines and fuels slumped during the COVID-19 pandemic, slowing the agency’s forthcoming rule tightening nitrogen oxides (NOx) limits for heavy-duty trucks. In the report released June 7, the OIG finds that the inability of staff to work in EPA’s National Vehicle and Fuel Emissions Laboratory (NVFEL) in Ann Arbor, MI, during much of 2020 resulted in a dramatic reduction in engine and fuel testing for...