Research Projects

Project at a Glance

Project Status: active

Title: Very low PM measurements for light-duty vehicles (E-99)

Principal Investigator / Author(s): Jung, Heejung

Contractor: UC Riverside

Contract Number: 12-320

Research Program Area: Emissions Monitoring & Control

Topic Areas: Mobile Sources & Fuels

Research Summary:

In 2012, the ARB adopted more stringent tailpipe particulate matter (PM) emissions standards for light-duty vehicles (LDVs) as part of the Advanced Clean Cars regulations. Auto companies have expressed concerns about the repeatability of PM measurements made at the very low emissions levels called for by these new standards. The objective of this project is to study improvements to the LDV certification test procedures that would result in reduced variability for PM measurements. Possible modifications include changes to emissions sample dilution, changes to filter face velocity, and/or other modifications to the Code of Federal Regulations (CFR), Part 1066 test procedures. Results from this project are expected to include specific recommended changes to the CFR Part 1066 to reduce test-to-test variability. The successful completion of this project will aid in the timely implementation of the ARB's lower PM emissions standards.


For questions regarding research reports, contact: Heather Choi at (916) 322-3893

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