CARB certifies next-generation Blue Bird school bus propane engine to be lowest NOx on the market


LIVONIA, MI. – ROUSH CleanTech is the first original equipment manufacturer to receive the California Air Resources Board’s 0.02 grams per brake horsepower-hour certification for model year 2022 vehicles. option is 90% cleaner than current emission standards for nitrogen oxides.

The new engine certification covers ROUSH CleanTech Gen 5 propane engines for Blue Bird school buses.

Propane is well established as an economical, clean, domestically produced alternative fuel for school buses. “Blue Bird is the leader in clean-emission school buses with more than a decade of sales experience and more than 20,000 clean, fuel-efficient propane school buses on the road,” said Matthew Stevenson, president and CEO of management of Blue Bird Corporation. “Equipping our buses with low nitrogen oxide propane engines is great news for the environment, our customers and our children. »

Nitrogen oxides, known as NOx, are a group of gases known to be major contributors to acid rain, smog and other air quality issues. According to the Environmental Protection Agency, exposure to NOx can trigger health problems, such as asthma and other respiratory problems, especially in children.

“Since the introduction of our Ford 7.3L V8 propane engine in 2020, our team has worked tirelessly to achieve this emissions certification,” said Todd Mouw, President of ROUSH CleanTech. “We remain committed to providing advanced, cost-effective vehicle solutions for the school bus market that reduce environmental impact.”

This is the second time ROUSH CleanTech has achieved Ultra Low NOx certification, previously for its 6.8L V10 propane engine in 2018. The certification is part of proposed federal emissions regulations that will come into effect in 2027. “We didn’t wait for the regulation to become law. We have already achieved it,” added Mouw.

Blue Bird Propane School Buses Equipped with Ultra Low NOx Engines Will Offer School Districts and School Bus Contractors Multiple Benefits in Seeking Funding from the New Clean School Bus Program investment in infrastructure and employment. The provision provides $2.5 billion for the purchase of low- or zero-emission school buses, including propane which is identified in the legislation as an emerging alternative fuel. Funding is expected to be released from 2022 and continue through 2026, with project implementation starting next year.

About Blue Bird Corporation: Blue Bird (Nasdaq: BLBD) is the leading independent designer and manufacturer of school buses, with more than 550,000 buses sold since its inception in 1927 and approximately 180,000 buses in service today. Blue Bird’s longevity and reputation in the school bus industry has made it an iconic American brand. Blue Bird distinguishes itself from its main competitors by its particular focus on the design, engineering, manufacture and sale of school buses and related parts. As the only manufacturer of chassis and bodies specifically designed for school bus applications, Blue Bird is recognized as an industry leader in product innovation, safety, quality/reliability/durability , operating costs and maneuverability. In addition, Blue Bird is the market leader in alternative fuel applications with its propane, electric and compressed natural gas school buses. Blue Bird manufactures school buses at two plants in Fort Valley, Georgia. Its joint venture Micro Bird operates a manufacturing facility in Drummondville, Quebec, Canada. Service and aftermarket parts are distributed from Blue Bird’s parts distribution center located in Delaware, Ohio. For more information on Blue Bird’s full line of buses, visit

About ROUSH CleanTech: ROUSH CleanTech, an industry leader in advanced clean transportation solutions, is a division of global engineering company Roush Enterprises. ROUSH CleanTech develops electric propulsion and propane autogas technology for Ford medium-duty utility vehicles and school buses. With more than 37,000 vehicles on the road, the Livonia, Michigan-based company provides cost-effective emission reduction options for fleets across North America. Learn more at or by calling 800.59.ROUSH.

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