Characterization of Ultrafine Particles and Other Vehicular Pollutants near an International Bridge in United States – Mexico Border Region

Details

• Personal Author:
  Pudota JK ; Wang Y ; Zhu Y
• Description:
  An intensive continuous hotspot study was conducted in the City of Laredo to characterize levels of ultrafine particles (UFP), black carbon (BC), nitrogen oxides (NOx), ozone (O3) and carbon monoxide (CO) from December 2007 to January 2008. Data were categorized into three different time periods: (1) Before Christmas, (2) During Christmas, and (3) After Christmas. The mean UFP number concentration throughout the study was 1.87 × 104 per cm3. Average traffic density was 1,099 per hour. The average concentrations of BC, CO, CO2, NOx, and O3 were 1.825 ug/m3, 0.05 parts per million (ppm), 499 ppm, 28 parts per billion (ppb), and 21.6 ppb, respectively. There was a significant correlation between both NOx and BC with UFP particle count, with R 2 = 0.63 and 0.60, respectively. Wind direction was found to have a significant effect on UFP and other pollutants. An exponential decay in UFP (20-290 nm) concentrations with increases in wind speed was observed. Significant correlation (R 2 = 0.99) was observed between the vehicle speed and the particle number emission factors. About a 1.5-fold increase in concentration of particle number emission factors was observed when the vehicle speed increased from 16 to 50 km/h. [Description provided by NIOSH]
• Subjects:
  Air Pollution Carbon Monoxide Occupational Health Ozone Particulate Matter Safety Transportation
• Keywords:
  Air Pollution Air Quality Author Keywords: Ultrafine Particles Automotive Emissions Carbon Black Carbon Monoxide Nitrous Oxides Particle Number Concentration Particle Number Emission Factor Particulates Ultrafine Particles Urban Air Quality Vehicular Pollutants

  More +
• ISBN:
  9789400771215
• Publisher:
  Science Plus Business Media
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Book
• Place as Subject:
  California ; OSHA Region 6 ; OSHA Region 9 ; Texas
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  43-62
• NIOSHTIC Number:
  nn:20055816
• Citation:
  Environmental sustainability issues in the South Texas-Mexico border region. Ramirez D, Ren J, Jones K, Lamm H eds. Dordrecht, Holland: Springer Science Plus Business Media, 2013 Aug; :43-62
• Contact Point Address:
  Yifang Zhu, Environmental Health Sciences Department, Jonathan and Karin School of Public School, University of California, Los Angeles, Los Angeles, USA
• Email:
  yifang@ucla.edu
• CAS Registry Number:
  Carbon black (CAS RN 1333-86-4) ; Carbon monoxide (CAS RN 630-08-0) ; Ozone (CAS RN 10028-15-6)
• Editor(s):
  Ramirez D; Ren J; Jones K; Lamm H
• Federal Fiscal Year:
  2013
• Performing Organization:
  University of California Los Angeles
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Environmental sustainability issues in the South Texas-Mexico border region
• End Date:
  20270630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:ac1885239f1bb2561d3291075a30fddc3e8b9f1041a5104f3db2af78417c16ac9aacaf0335c89daf7fd1430b188409dc0c31fa064647c9984086cb7cb0182476
• Download URL:
  https://stacks.cdc.gov/view/cdc/213584/cdc_213584_DS1.pdf
• File Type:
  [PDF - 3.16 MB ]