Characterizing Impacts of Emission Control Technologies on In-use Heavy-duty Diesel Trucks
Heavy-duty diesel trucks are a major source of nitrogen oxides (NOx) and black carbon (BC) in urban environments, contributing to persistent ozone and particulate matter (PM) air quality problems. Recently, diesel particle filter (DPF) and selective catalytic reduction (SCR) emission control systems that target exhaust PM and NOx, respectively, have become standard equipment on new trucks. To evaluate the in-use performance of DPF and SCR systems, pollutant emissions from thousands of diesel trucks were measured over several years at the Port of Oakland and the Caldecott Tunnel in the San Francisco Bay Area. Fuel-based emission factors (g pollutant emitted per kg fuel burned) were calculated for individual trucks and linked via recorded license plates to vehicle attributes, including engine model year and installed emission control systems. Emissions changes due to DPF and SCR were evaluated, including overall performance, effects on co-emitted pollutant species, durability of aging after-treatment control systems, and related environmental impacts.
Affiliate, Transportation Initiative, Sustainable Energy Systems Group, Sustainable Energy & Environmental Systems Department, Energy Analysis & Environmental Impacts Division
Chelsea Preble is an Assistant Research Engineer in the Department of Civil and Environmental Engineering at UC Berkeley and Affiliate in the Energy Technologies Area at Berkeley Lab. She's a Golden Bear through-and-through, earning her BS in Environmental Sciences from UC Berkeley in 2010, MS in Environmental Engineering in 2013, and PhD in Environmental Engineering in 2017. Her research interests include characterizing in-use emission sources and their controls, developing community-based air quality sensor networks, and evaluating the real-world emissions impacts of new regulations and alternative energy technologies.