Organic composition of ultrafine particles formed from automotive braking
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Non-exhaust emissions (e.g., automotive brake and tire wear) are quickly replacing exhaust emissions as the dominant traffic particulate pollutant. Despite this, a thorough exploration of the composition of particles from these sources is lacking, particularly the organic fraction. Due to their unique health implications, knowledge of the composition of ultrafine particles (<100 nm in diameter) is of particular interest. Here we report on the size-selected organic composition of ultrafine particles nucleated during high brake temperature conditions generated using a custom brake dynamometer system and two common brake pad types. Using high resolution mass spectrometry, we find that the organic composition of these particles is dominated by species containing oxygen (CHO) and nitrogen (CHN/CHON). Many of these compounds are unsaturated and are attributed to the thermal degradation of resin material used in the pad formulation. Other abundant compounds include various glyco..., , # Data from: Organic composition of ultrafine particles formed from automotive braking
Name: James Smith
ORCID: 0000-0003-4677-8224
Institution: University of California, Irvine
Address: Rowland Hall Room 317C, Irvine, CA 92697
Email: [jimsmith@uci.edu](mailto:jimsmith@uci.edu)
Author/Associate or Co-investigator Information
Name: Adam Thomas
Institution: University of California, Irvine
Address: Irvine, CA 92697
Email: [adamet1@uci.edu](mailto:adamet1@uci.edu)
Date of data collection: 2022-08 to 2024-08
Geographic location of data collection: Irvine, CA, USA.
Information about funding sources that supported the collection of the data:
California Department of Justice (no. AERTF-221620)
National Science Foundation (no. 2327825)
In addition, this material is based upon work supported by the National Science Foundation under Award no. 2324901.
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Licenses/restrictions placed on the data: None.
Links to publications that cite or use the data:
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创建时间：
2025-11-06
