CARB, EPA Test For Low-NOx Truck Rule, But Future Clash May Loom

EPA and California officials are jointly testing various technologies to assess options for a new, low-nitrogen oxide (NOx) standard for heavy-duty truck engines, but it remains unclear whether California's plan to propose its own strict rule in 2019 will conflict with EPA's hands-off approach, undercutting broad industry calls for one national standard. The California Air Resources Board (CARB) “has been coordinating closely with EPA technical staff on the development of the next generation of NOx standards for heavy-duty truck engines,”...