Vehicle, driver and atmospheric factors in light-duty vehicle particle number emissions.

Details

• Creators:
  Jackson, Erick ; Aultman-Hall, Lisa ; Holmen, Britt
• Corporate Creators:
  University of Vermont. Transportation Research Center
• Corporate Contributors:
  United States. National Science Foundation
• Subject/TRT Terms:
  Data Collection Exhaust Gases Human Factors Light Vehicles Particulates Pollutants Speed Upgrades (Roads)
• Publication/ Report Number:
  UVM TRC Report # 14-006
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  University of Vermont. Transportation Research Center
• Abstract:
  Made possible by the collection of on-board tailpipe emissions data, this research identifies road
  
  and driver factors that are associated with a relatively understudied tailpipe pollutant from light-duty vehicles: ultrafine particle number emissions. High emission events (HEE) of ultrafine
  
  particle number (PN) emissions occurred most frequently at locations with steep upgrades or
  
  locations that required moderate to rapid accelerations (>3 mph/s). The analysis revealed that
  
  less than 2% of the time driving was responsible for almost a third of all ultrafine particles
  
  emitted along the designated 17-mile test route for a sample of 22 drivers. Variables identified
  
  in a generalized linear model as significant to PN emissions include measures of engine speed
  
  (RPM), driver behavior (speed and acceleration rates), and road geometry (grade). These factors
  
  account for approximately 61% of the variability measured. Few modal emissions models
  
  estimate PN emissions; however, this research has revealed that the same predictor variables
  
  used to model gas pollutants are significant predictors of PN emissions. Therefore, the addition
  
  of PN emissions estimates to existing models would require little effort if these relationships
  
  were developed with larger datasets. This project also documented additional challenges related
  
  to on-board PN data collection related to temperature, humidity, and background PN
  
  concentrations. Finally, a large amount of the variation in light-duty PN emissions remains
  
  unexplained, suggesting a need for more comprehensive on-board datasets, including data on
  
  particle size distribution.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:623a6f4cd4bd3cc7048b65e3c20ebfbfc79f9348bad1507a44d38e49f080572a87669ce7956c09506262a777558c03295f400d8ac82d31f5097dca9b5eb635c8
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27438/dot_27438_DS1.pdf
• File Type:
  [PDF - 1.04 MB ]