Study: Heavy-Duty Natural Gas Engine Aces California Emissions Tests

The study results underscore the importance of the near-zero truck engines for cleaning the air. Most heavy-duty vehicles on roads today are diesel-powered and represent one of the largest sources of nitrogen oxide (NOx), or smog-forming, emissions and fuel consumption in North America. By contrast, the new near-zero emissions 12-liter engine, made by Cummins Westport, is the only heavy-duty engine in the category to not only meet, but exceed, the California Air Resources Board’s cleanest optional low-NOx standard of 0.02 g/bhp-hr.

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