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NOx-driven chemical transformation of terpene mixtures: Linking highly oxygenated organic molecules to health effects in secondary organic aerosol.

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Title: NOx-driven chemical transformation of terpene mixtures: Linking highly oxygenated organic molecules to health effects in secondary organic aerosol.
Authors: Chen, Xiaowen1 (AUTHOR), Li, Kun1 (AUTHOR) kun.li@sdu.edu.cn, Li, Ruiyu1 (AUTHOR), Fang, Li1 (AUTHOR), Bian, Haizhen2 (AUTHOR), Jiang, Wei1 (AUTHOR), Yan, Caiqing1 (AUTHOR), Du, Lin1 (AUTHOR)
Source: Journal of Environmental Sciences (Elsevier). May2026, Vol. 163, p637-647. 11p.
Subject Terms: *Nitrogen oxides, *Aerosols, *Organic compounds, *Volatile organic compounds, Toxicological interactions, Oxidative stress, Hydrogen peroxide
Abstract: Biogenic volatile organic compounds (BVOCs), particularly terpenes, represent the dominant global source of secondary organic aerosols (SOA). However, the crucial investigation in terpene mixture under various nitrogen oxides (NO x) conditions needs to be further explored. To comprehensively understand the mixed SOA composition and its associated health effects, we simulated the mixed oxidation of α -pinene and isoprene in a smog chamber under various NO x conditions to investigate SOA formation and its related health effects. We found that increasing NO x levels led to the formation of CHON compounds, suppressing functionalized products and oligomers. Results of the oxidative potential and total peroxides of SOA showed that mixed SOA had combined redox characteristics (isoprene SOA > mixed SOA > α -pinene SOA). The oxidative potential of isoprene SOA decreased as NO x increased, while α -pinene SOA was slightly affected. Results from iodometry combined with mass spectrometry indicated that hydrogen peroxides (ROOH) in highly oxygenated molecules played a crucial role in SOA health effects. NO x was found to influence the production of ROOH by interfering with the RO 2 + HO 2 and RO 2 isomerization pathways. These results indicate that the reactive intermediate components in BVOC mixture under various NO x conditions are important factors influencing health effects of aerosol. [Display omitted] [ABSTRACT FROM AUTHOR]
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Database: GreenFILE
Description
Abstract:Biogenic volatile organic compounds (BVOCs), particularly terpenes, represent the dominant global source of secondary organic aerosols (SOA). However, the crucial investigation in terpene mixture under various nitrogen oxides (NO x) conditions needs to be further explored. To comprehensively understand the mixed SOA composition and its associated health effects, we simulated the mixed oxidation of α -pinene and isoprene in a smog chamber under various NO x conditions to investigate SOA formation and its related health effects. We found that increasing NO x levels led to the formation of CHON compounds, suppressing functionalized products and oligomers. Results of the oxidative potential and total peroxides of SOA showed that mixed SOA had combined redox characteristics (isoprene SOA > mixed SOA > α -pinene SOA). The oxidative potential of isoprene SOA decreased as NO x increased, while α -pinene SOA was slightly affected. Results from iodometry combined with mass spectrometry indicated that hydrogen peroxides (ROOH) in highly oxygenated molecules played a crucial role in SOA health effects. NO x was found to influence the production of ROOH by interfering with the RO 2 + HO 2 and RO 2 isomerization pathways. These results indicate that the reactive intermediate components in BVOC mixture under various NO x conditions are important factors influencing health effects of aerosol. [Display omitted] [ABSTRACT FROM AUTHOR]
ISSN:10010742
DOI:10.1016/j.jes.2025.09.004