Cummins Westport Inc. (CWI) today announced the new ISL G Near Zero (NZ) NOx natural gas engine is the first MidRange engine inNorth Americato receive emission certifications from both U.S. Environmental Protection Agency (EPA) and Air Resources Board (ARB) inCaliforniathat meet the 0.02 g/bhp-hr optional Near Zero NOx Emissions standards for medium-duty truck, urban bus, school bus and refuse applications