Leading the way?

By Charlie Morasch, contributing writer

As all truck drivers who have visited California in recent years know, the Golden State’s association with beaches and movie stars is second only to its ever growing stack of emissions regulations.

APUs are no exception.

Billed first as a way to consume less diesel and emit less pollutants than trucks of previous generations, the emissions from APUs have for years been subject to treatment by diesel particulate filters. The California Air Resources Boards’s APU rules are meant to ensure the anti-idling devices don’t spit out emissions more toxic than an idling truck.

Diesel-fueled APUs operating on a truck with a 2007 or newer engine must be fitted with a Level 3 particulate control device, otherwise known as a DPF, or have the APU’s exhaust plumbed into the vehicle’s exhaust system before going through the truck’s DPF. In addition, the words “Verified Clean APS” must be affixed to the truck’s hood.

APUs for trucks on 2006 and older model year engines need only to meet California or federally certified internal-combustion system standards. Problem is, California’s Truck and Bus Rule negates the possibility of all but a few 2006 model year and older trucks on the state’s highways.

For more information, be sure to visit CARB’s Truckstop website at www.arb.ca.gov. LL