Preprints
https://doi.org/10.5194/egusphere-2025-1147
https://doi.org/10.5194/egusphere-2025-1147
24 Mar 2025
 | 24 Mar 2025

Continuous chemical characterization of ultrafine particulate matter (PM0.1)

Georgia A. Argyropoulou, Kalliopi Florou, and Spyros N. Pandis

Abstract. Ultrafine particles (diameter less than 100 nm) are primary suspects for enhanced negative health effects on humans. Measuring the chemical composition and physical properties of ultrafine particles on-line, continuously, and accurately is particularly challenging because of their typically low mass concentration (PM0.1) and susceptibility to interference from larger particles. The few past PM0.1 chemical composition measurement studies have used cascade impactors and at least daily temporal resolution. In this study we perform for the first time high temporal measurements of the composition and sources of PM0.1 using an aerodynamic aerosol classifier (AAC) to separate PM0.1 from larger particles. A high-resolution time of flight aerosol mass spectrometer (HR-ToF-AMS, for sulfate, nitrate, organics, chloride), a single particle soot photometer (SP2-XR, for black carbon) and an Xact625i (for elements) are also used.

Ambient PM0.1 composition measurements were conducted in a suburban area in Greece to test the system. The hourly PM0.1 levels varied from 0.4 to 1.5 μg m-3, with an average of 0.7 μg m-3. Most of the PM0.1 (45 %) was organic aerosol (OA). On average, sulfates contributed 14 %, ammonium 7 %, nitrate 3 %, and black carbon 4 % to PM0.1. Calcium (Ca) showed a surprising high average contribution to PM0.1 (18 %). The rest of the detected elements were Fe, K, Zn and Ti, contributing together 7 %. Source apportionment analysis showed that most of the PM0.1 OA, during this summertime period, was oxygenated OA (90 %), with 70 % being less oxidized and 20 % being more oxidized, while only 10 % was fresh hydrocarbon-like OA.

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Journal article(s) based on this preprint

01 Oct 2025
Continuous chemical characterization of ultrafine particulate matter (PM0.1)
Georgia A. Argyropoulou, Kalliopi Florou, and Spyros N. Pandis
Atmos. Meas. Tech., 18, 4969–4983, https://doi.org/10.5194/amt-18-4969-2025,https://doi.org/10.5194/amt-18-4969-2025, 2025
Short summary
Georgia A. Argyropoulou, Kalliopi Florou, and Spyros N. Pandis

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-1147', Anonymous Referee #1, 12 Apr 2025
    • AC1: 'Response to the Comments of Reviewer 1', Spyros Pandis, 09 Jun 2025
  • EC1: 'Editor comment on egusphere-2025-1147: Review received', Hartmut Herrmann, 14 Apr 2025
    • AC2: 'Response to the Comments of Reviewer 2', Spyros Pandis, 09 Jun 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-1147', Anonymous Referee #1, 12 Apr 2025
    • AC1: 'Response to the Comments of Reviewer 1', Spyros Pandis, 09 Jun 2025
  • EC1: 'Editor comment on egusphere-2025-1147: Review received', Hartmut Herrmann, 14 Apr 2025
    • AC2: 'Response to the Comments of Reviewer 2', Spyros Pandis, 09 Jun 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Spyros Pandis on behalf of the Authors (10 Jul 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (17 Jul 2025) by Hartmut Herrmann
AR by Spyros Pandis on behalf of the Authors (19 Jul 2025)

Journal article(s) based on this preprint

01 Oct 2025
Continuous chemical characterization of ultrafine particulate matter (PM0.1)
Georgia A. Argyropoulou, Kalliopi Florou, and Spyros N. Pandis
Atmos. Meas. Tech., 18, 4969–4983, https://doi.org/10.5194/amt-18-4969-2025,https://doi.org/10.5194/amt-18-4969-2025, 2025
Short summary
Georgia A. Argyropoulou, Kalliopi Florou, and Spyros N. Pandis
Georgia A. Argyropoulou, Kalliopi Florou, and Spyros N. Pandis

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Short summary
Ultrafine particles (diameter less than 100 nm) are suspected to cause significant health effects. Accurately measuring their chemical composition and physical properties in real-time is challenging due to their low mass and interference from larger particles. This study proposes a method for the continuous, automated measurement of their composition, tested in a pilot field study to explore their chemical characteristics, physical properties, and sources.
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