Research Projects

Project at a Glance

Project Status: active

Title: On-road measurment of emissions from heavy-duty diesel trucks: impacts of fleet turnover and ARB's truck & bus rule

Principal Investigator / Author(s): Harley, Robert

Contractor: UC Berkeley

Contract Number: 09-340

Research Program Area: Atmospheric Processes, Emissions Monitoring & Control

Topic Areas: Field Studies, Impacts, Mobile Sources & Fuels

Research Summary:

Heavy-duty diesel (HDD) vehicles are an important source of emissions of nitrogen oxides (NOX) and particulate matter (PM), however, their emissions are expected to be reduced due to recent regulatory changes. National emission standards for new HDD vehicles are being phased in between 2007 and 2010. Existing older HDD vehicles in California will have accelerated engine replacement and retrofits with virtually all retrofitted by 2014 to meet current PM emission standards and about half to meet current NOX standards. The proposed research will measure emissions from a large sample of individual HDD vehicles operating in 2011 and 2013. The proposed research will build upon results from measurements of emissions from individual trucks that were operating under similar conditions in 2006 and assess the extent of changes in distributions of emissions.


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

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