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HEAVY DUTY DIESEL FINE PARTICULATE MATTER EMISSIONS: DEVELOPMENT AND APPLICATION OF ON-ROAD MEASUREMENT CAPABILITIES: SYMPOSIUM/CONFERENCE
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NRMRL-RTP-230 Brown, J.E. Heavy Duty Diesel Fine Particulate Matter Emissions: Development and Application of On-Road Measurement Capabilities. EPA/600/R-01/079 (NTIS PB2002-100140). 09/27/2001 The report discusses EPA's On-Road Diesel Emissions Characterization Facility, which has been collecting real-world gaseous emissions data for the past 6 years. It has recently undergone extensive modifications to enhance its particulate matter (PM) measurement capabilities, with specific emphasis on fine PM or PM-2.5 (particles smaller than 2.5 micrometers in aerodynamic diameter). At present the facility's capabilities are focused on tontinuous sampling and analysis, using fast-responding instruments such as the Electrical Low- pressure Impactor (ELPI), the Tapered-element Oscillating Microbalance (TEOM), and a particle-bound Polycyclic Aromatic Hydrocarbon (PAH) analyzer, all of which require a dilute wexhaust sample. This dilute sample has been drawn directly from the vehicle exhaust via a stack dilution system, and sampled from the ambient exhaust plume via probes in the trailer. Dilute samples have also been collected on filters for chemical and gravimetric analysis. Experimental results indicate that stack dilution sampling does not adequately represent real- world conditions as determined from initial plume sampling. Therefore, future efforts will be directed toward improved plume characterization techniques.