Articles | Volume 23, issue 12
Measurement report
30 Jun 2023
Measurement report |  | 30 Jun 2023

Measurement report: Atmospheric aging of combustion-derived particles – impact on stable free radical concentration and its ability to produce reactive oxygen species in aqueous media

Heather L. Runberg and Brian J. Majestic

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Cited articles

Aguilera, R., Corringham, T., Gershunov, A., and Benmarhnia, T.: Wildfire smoke impacts respiratory health more than fine particles from other sources: observational evidence from Southern California, Nat. Commun., 12, 1493,, 2021. 
Akherati, A., He, Y., Garofalo, L. A., Hodshire, A. L., Farmer, D. K., Kreidenweis, S. M., Permar, W., Hu, L., Fischer, E. V., Jen, C. N., Goldstein, A. H., Levin, E. J. T., DeMott, P. J., Campos, T. L., Flocke, F., Reeves, J. M., Toohey, D. W., Pierce, J. R., and Jathar, S. H.: Dilution and photooxidation driven processes explain the evolution of organic aerosol in wildfire plumes, Environmental Science: Atmospheres, 2, 1000–1022,, 2022. 
Arangio, A. M., Tong, H., Socorro, J., Pöschl, U., and Shiraiwa, M.: Quantification of environmentally persistent free radicals and reactive oxygen species in atmospheric aerosol particles, Atmos. Chem. Phys., 16, 13105–13119,, 2016. 
Borman, P. and Elder, D.: Q2(R1) Validation of Analytical Procedures, in: ICH Quality Guidelines, John Wiley & Sons, Ltd, 127–166,, 2017. 
Brook, R. D., Xu, X., Bard, R. L., Dvonch, J. T., Morishita, M., Kaciroti, N., Sun, Q., Harkema, J., and Rajagopalan, S.: Reduced metabolic insulin sensitivity following sub-acute exposures to low levels of ambient fine particulate matter air pollution, Sci. Total Environ., 448, 66–71,, 2012. 
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Environmentally persistent free radicals (EPFRs) are an emerging pollutant found in soot particles. Understanding how these change as they move through the atmosphere is important to human health. Here, soot was generated in the laboratory and exposed to simulated sunlight. The concentrations and characteristics of EPFRs in the soot were measured and found to be unchanged. However, it was also found that the ability of soot to form hydroxyl radicals was stronger for fresh soot.
Final-revised paper