At the end of 2015, an ultra-clean heavy-duty engine was announced to have received an emissions certification that is 90% cleaner than the current Environmental Protection Agency (EPA) standard for emissions of nitrogen oxides (NOx). Today, we are seeing trucks with these incredibly clean engines roll off the assembly line and into fleet operations across the nation. The Cummins Westport ISL G ultra-low NOx natural gas engine is the first commercially available heavy-duty engine to emit ...

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