Mobile and Fixed-Site Measurements to Identify Spatial Distributions of Traffic-Related Pollution Sources in Los Angeles

Details

• Personal Author:
  Gould TR ; Larson T ; Simpson CD ; Tessum MW ; Vedal S ; Yost MG
• Description:
  Mobile monitoring and fixed-site monitoring using passive sampling devices (PSD) are popular air pollutant measurement techniques with complementary strengths and weaknesses. This study investigates the utility of combining data from concurrent 2-week mobile monitoring and fixed-site PSD campaigns in Los Angeles in the summer and early spring to identify sources of traffic-related air pollutants (TRAP) and their spatial distributions. There were strong to moderate correlations between mobile and fixed-site PSD measurements of both NO2 and NOx in the summer and spring (Pearson's r between 0.43 and 0.79), suggesting that the two data sets can be reliably combined for source apportionment. PCA identified the major TRAP sources as light-duty vehicle emissions, diesel exhaust, crankcase vent emissions, and an independent source of combustion-derived ultrafine particle emissions. The component scores of those four sources at each site were significantly correlated across the two seasons (Pearson's r between 0.58 and 0.79). Spatial maps of absolute principal component scores showed all sources to be most prominent near major roadways and the central business district and the ultrafine particle source being, in addition, more prominent near the airport. Mobile monitoring combined with fixed-site PSD sampling can provide high spatial resolution estimates of TRAP and can reveal underlying sources of exposure variability. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Air Pollution Nitrogen Dioxide Occupational Health Safety Transportation
• Keywords:
  Air Pollutants Air Pollution Sampling Air Quality Monitoring Automotive Emissions Diesel Exhaust Nitrogen Dioxide Nitrogen Oxides Sampling Methods
• ISSN:
  0013-936X
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 10 ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  52
• Issue:
  5
• NIOSHTIC Number:
  nn:20063837
• Citation:
  Environ Sci Technol 2018 Mar; 52(5):2844-2853
• Contact Point Address:
  Mei W. Tessum, Department of Environmental and Occupational Health Sciences, University of Washington, Box 357234, Seattle, Washington 98198, United States
• Email:
  mtessum@uw.edu
• CAS Registry Number:
  Nitrogen dioxide (CAS RN 10102-44-0)
• Federal Fiscal Year:
  2018
• Performing Organization:
  University of Washington
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Environmental Science and Technology
• End Date:
  20250630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:c24497519d7323b27f95ad9e39210d316f236abfb304db0c9954ab44251449b6f1d4a9683bbab56b1406aa3c70d658e3195a5d2f602f687b6947d78e11da5c2c
• Download URL:
  https://stacks.cdc.gov/view/cdc/222384/cdc_222384_DS1.pdf
• File Type:
  [PDF - 4.05 MB ]