Research Contracts

New Search

Project at a Glance

Title: Measurement of diesel solid nanoparticle emissions using a catalytic stripper for comparison to Europe's PMP Protocol

Principal Investigator / Author(s): Jung, Heejung

Contractor: UC Riverside

Contract Number: 08-302

Research Program Area: Emissions Monitoring & Control

Topic Areas: Mobile Sources & Fuels


This project extends the California Air Resources Board’s (ARB) recently accomplished Particle Measurement Program (PMP) study (contract 05-320) and other related in-house investigations, which provided critical evaluations of the instruments and sampling methods specified in Europe’s PMP measurement protocol. The PMP prescribes regulatory specifications for sampling PM emissions from both gasoline (direct-injection) and diesel vehicles having very low PM mass emissions. The results demonstrated that the PMP protocol yields robust and repeatable measurements of solid particles larger than approximately 23 nanometers (nm) in aerodynamic diameter. However, using the PMP approach, ARB and other investigators have observed high number concentrations of apparently “solid” sub-23 nm particles downstream of the PMP sampling system. In this project, an alternative PMP system using a Catalytic Stripper (CS) for sample conditioning, rather than the evaporation tube or volatile particle remover (VPR) specified in the PMP method, will be compared to a PMP clone of the reference sampler. The CS has been demonstrated to completely remove volatile compounds such as sulfur and organics and to suppress the formation of nucleating particles. Vehicle emissions tests will involve the University of California, Riverside (UCR) College of Engineering – Center for Environmental Research and Technology (CE-CERT) mobile emissions laboratory (MEL) for over-the-road testing of heavy-duty diesel vehicles (HDDV) equipped with a diesel particle filter (DPF) meeting the current California emissions standards.


For questions regarding this research project, including available data and progress status, contact: Research Division staff at (916) 445-0753

Stay involved, sign up with CARB's Research Email Distribution List