Science Inventory

HEAVY DUTY DIESEL FINE PARTICULATE MATTER EMISSIONS: DEVELOPMENT AND APPLICATION OF ON-ROAD MEASUREMENT CAPABILITIES

Citation:

Brown, J. E. HEAVY DUTY DIESEL FINE PARTICULATE MATTER EMISSIONS: DEVELOPMENT AND APPLICATION OF ON-ROAD MEASUREMENT CAPABILITIES . U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-01/079, 2001.

Description:

EPA's On-road Diesel Emissions Characterization Facility, which has been collecting real-world gaseous
emissions data for the past 6 years, has recently undergone extensive modifications to enhance the facility's
particulate matter (PM) measurement capabilities, with specific emphasis on fine PM or PM2.5 (particles
less than 2.5 pm in aerodynamic diameter). At present, the facility's capabilities are focused on continuous
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 exhaust 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.

Record Details:

Record Type:DOCUMENT( REPORT )
Product Published Date:09/01/2001
Record Last Revised:12/22/2005
Record ID: 29373