California Transit Authority Debuts First Near-Zero Emission Engine

The Riverside Transit Agency (RTA) has unveiled its first near-zero natural gas vehicle, a 40-foot bus equipped with the Cummins Westport ISL G 280 NZ engine. RTA says the new engine has a 90 percent reduction in nitrogen oxide emissions and 15 percent reduction in greenhouse gases, compared to its already clean-burning engines.

The new engine gets better performance due to an enhanced control system that monitors sensors on the fuel and ignition systems. Other factors include a three-way catalyst that’s packaged as part of the muffler and provides consistent emissions control, and closed crankcase ventilation system that reduces emissions.

“RTA is proud to be a long-time advocate of cleaner, greener technologies,” said RTA Chair Linda Krupa. “This is another example of how we are exploring new and innovative ways to travel.”

The new engine was made possible by a $10,000 grant from the South Coast Air Quality Management District.