CARB Adopts Landmark Small-Engine Rules, Truck Smog Check Program

California’s air board has approved landmark rules requiring new small off-road engines (SORE) used in lawn and other outdoor equipment to have zero emissions beginning in 2024, as well as a first-time smog check program for heavy-duty diesel trucks, both of which aim to dramatically cut conventional and climate pollution in the Golden State. “This is the biggest day for clean-air action in California in over 12 years, and it’s about time that diesel trucks face the kind of smog...