CARB certifies ROUSH CleanTech’s Gen 5 propane engine for Blue Bird school buses to ultra-low NOx standards
Green Car Congress
JANUARY 24, 2022
grams per brake horsepower-hour certification for 2022 model year vehicles. The optional ultra-low CARB certification is 90% cleaner than current emissions standards for nitrogen oxides. Propane is well established as an economical, clean and domestically produced alternative fuel for school buses.
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