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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]
Copyright of Journal of Environmental Sciences (Elsevier) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: NOx-driven chemical transformation of terpene mixtures: Linking highly oxygenated organic molecules to health effects in secondary organic aerosol.
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  Data: <searchLink fieldCode="AR" term="%22Chen%2C+Xiaowen%22">Chen, Xiaowen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Kun%22">Li, Kun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> kun.li@sdu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Li%2C+Ruiyu%22">Li, Ruiyu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fang%2C+Li%22">Fang, Li</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bian%2C+Haizhen%22">Bian, Haizhen</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jiang%2C+Wei%22">Jiang, Wei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yan%2C+Caiqing%22">Yan, Caiqing</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Du%2C+Lin%22">Du, Lin</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Environmental+Sciences+%28Elsevier%29%22">Journal of Environmental Sciences (Elsevier)</searchLink>. May2026, Vol. 163, p637-647. 11p.
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  Data: *<searchLink fieldCode="DE" term="%22Nitrogen+oxides%22">Nitrogen oxides</searchLink><br />*<searchLink fieldCode="DE" term="%22Aerosols%22">Aerosols</searchLink><br />*<searchLink fieldCode="DE" term="%22Organic+compounds%22">Organic compounds</searchLink><br />*<searchLink fieldCode="DE" term="%22Volatile+organic+compounds%22">Volatile organic compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Toxicological+interactions%22">Toxicological interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidative+stress%22">Oxidative stress</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen+peroxide%22">Hydrogen peroxide</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Environmental Sciences (Elsevier) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jes.2025.09.004
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      – Code: eng
        Text: English
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        PageCount: 11
        StartPage: 637
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      – SubjectFull: Nitrogen oxides
        Type: general
      – SubjectFull: Aerosols
        Type: general
      – SubjectFull: Organic compounds
        Type: general
      – SubjectFull: Volatile organic compounds
        Type: general
      – SubjectFull: Toxicological interactions
        Type: general
      – SubjectFull: Oxidative stress
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      – SubjectFull: Hydrogen peroxide
        Type: general
    Titles:
      – TitleFull: NOx-driven chemical transformation of terpene mixtures: Linking highly oxygenated organic molecules to health effects in secondary organic aerosol.
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            NameFull: Chen, Xiaowen
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            NameFull: Li, Kun
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            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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              Value: 163
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            – TitleFull: Journal of Environmental Sciences (Elsevier)
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