Research Projects

Project at a Glance

Project Status: complete

Title: Development of a simplified field test method for PM compliance screening of stationary and portable CI engines.

Principal Investigator / Author(s): Welch, William; Miller, Bryan

Contractor: UC Riverside

Contract Number: 04-330

Research Program Area: Emissions Monitoring & Control

Topic Areas: Mobile Sources & Fuels, Stationary Sources


In 1998 the California air Resources Board (CARB) identified diesel exhaust particulate matter (PM) as a toxic air contaminant (TAC) and since then the ARB has been implementing Air Toxic Control Measures (ATCMs) to reduce public exposure to diesel PM. The current method to measure PM emissions from stationary sources is ARB Method 5. However, this method is very time consuming, costly and may not be appropriate for diesel sources with controls. Thus CARB and the University of California, Riverside (UCR) tried to develop a simpler, faster and less expensive field test method for measuring PM emissions from stationary and portable diesel engines; one that local districts could afford and use for enforcement. The research proposal considered a Simplified Field Test Method (SFTM) using: a single port sampler of raw exhaust, CO2 emissions as the surrogate of load, and basing total PM mass on the filter catch. Additionally, the research tested two real time PM instruments, including an inexpensive (~$6K) non-filter-based PM measurement method based on laser light scattering photometry (LLSP) and an expensive (~$60K) instrument.

Tests of a number of diesel engines compared the PM mass measured with CARB M5, federal reference methods and the proposed Simplified Field Test Method. Results showed the SFTM and the federal reference methods were statistically the same and the M5 was biased high because of the impinger catch. Results showed that field measurements of the PM from a diesel engine with an efficient diesel particulate filter (DPF) installed is difficult for all methods to measure. Further work is needed to improve the precision of the SFTM and the real time PM monitors.


For questions regarding this research project, including available data and progress status, contact: Heather Choi at (916) 322-3893

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