Contributions of non-tailpipe emissions to near-road PM₂.₅ and PM₁₀: A chemical mass balance study

As the importance of non-tailpipe particles (NTP) over tailpipe emissions from urban traffic has been increasing, there is a need to evaluate NTP contributions to ambient particulate matter (PM) using representative source profiles. The Brake and Tire Wear Study conducted in Los Angeles, California in the winter of 2020 collected 64 PM₂.₅ and 64 PM₁₀ samples from 32 pairs of downwind-upwind measurements at two near-road locations (I-5 in Anaheim and I-710 in Long Beach). These samples were characterized for inorganic and organic markers and, along with locally-developed brake wear, tire wear, and road dust source profiles, subject to source apportionment using the effective-variance chemical mass balance (EV-CMB) model. Model results highlighted the dominance of resuspended dust in both PM₂.₅ (23–33%) and PM₁₀ (32–53%). Brake and tire wear contributed more to PM₂.₅ than tailpipe exhausts (diesel + gasoline) for I-5 (29–30% vs. 19–21%) while they were comparable for I-710 (15–17% vs. 15–19%). For PM₁₀, the brake and tire wear contributions were 2–3 times the exhaust contributions. Different fleet compositions on and near I-5 and I-710 appeared to influence the relative importance of NTP and exhaust sources. The downwind-upwind differences in source contributions were often insignificant, consistent with small and/or nearly equal impacts of adjacent highway traffic emissions on the downwind and upwind sites. The usability of sole markers, such as barium and zinc, to predict brake and tire wear abundance in ambient PM is discussed.

• Record URL:
  • https://doi.org/10.1016/j.envpol.2023.122283
• Record URL:
  • http://www.sciencedirect.com/science/article/pii/S026974912301285X
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02697491
• Supplemental Notes:
  • © 2023 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
• Authors:
  • Chen, L-W Antony
  • Wang, Xiaoliang
  • Lopez, Brenda
  • Wu, Guoyuan
  • Ho, Steven S H
  • Chow, Judith C
  • Watson, John G
  • Yao, Qi
  • Yoon, Seungju
  • Jung, Heejung
• Publication Date: 2023-10-15

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: 122283
• Serial:
  • Environmental Pollution
  • Volume: 335
  • Issue Number: 0
  • Publisher: Elsevier Publishing Company, Limited
  • ISSN: 0269-7491
  • Serial URL: http://www.journals.elsevier.com/environmental-pollution

Subject/Index Terms

• TRT Terms: Brakes; Chemical composition; Particulates; Pollutants; Tires; Wear
• Geographic Terms: Anaheim (California); Long Beach (California); Los Angeles (California)
• Subject Areas: Environment; Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 01890422
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 23 2023 10:14AM