AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA
Abstract View
Effects of Diesel Particle Filters on Heavy-Duty Diesel Truck Emissions at the Port of Oakland
CHELSEA PREBLE, Timothy Dallmann, Steven DeMartini, Nathan Kreisberg, Susanne Hering, Robert Harley, Thomas Kirchstetter, University of California, Berkeley
Abstract Number: 585 Working Group: Urban Aerosols
Abstract To accelerate pollutant emission reductions from heavy duty-diesel trucks around ports and rail yards, the California Air Resources Board’s Drayage Truck Regulation required replacement of trucks with pre-1994 engines and retrofit with diesel particle filters (DPFs) of trucks with newer engines. Previous studies at the Port of Oakland monitored the pollutant emission effects of initial phases of this regulation. New measurements in March 2013 were made after all trucks in the fleet had either been replaced with newer filter-equipped engines or retrofit with DPFs. Pollutants were measured in the exhaust plumes of individual heavy-duty trucks at high time resolution (1-2 Hz) as the trucks drove by a mobile lab that was parked on a bridge above the traffic en route to the Port. We measured ultrafine particle number concentration and size distribution, black carbon concentration, and concentrations of nitrogen oxides (NO$_X and NO). These emissions were linked on a truck-by-truck basis to detailed information about each engine and installed emission control equipment. This analysis examines the change in the distribution of pollutant emissions across all Port trucks as a result of the Drayage Truck Regulation and the emissions characteristics of various truck subpopulations based on engine model year and types of emission controls. In addition, the ultrafine particle and NO$_2 emissions impacts of retrofit and new-engine DPFs and selective catalytic reduction systems are examined. These results are significant as California is now requiring a similar cleanup of nearly all on-road heavy-duty diesel trucks and buses operating in the state and other states are likely to follow California’s lead.