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Unveiling the effect of O2 on the photochemical reaction of NO2 with polycyclic aromatic hydrocarbons

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Abstract

The photochemical reaction of NO2 with organics may be a source of atmospheric HONO during the daytime. Here, the conversion of NO2 to HONO on polycyclic aromatic hydrocarbons (PAHs) under solar irradiation under aerobic and anaerobic conditions was investigated using a flow tube reactor coupled to a NOx analyzer. O2 played an inhibition role in NO2 uptake and HONO formation on PAHs, as shown by 7%–45% and 15%–52% decrease in NO2 uptake coefficient (γ) and HONO yield (YHONO), respectively. The negative effect of O2 on the reaction between NO2 and PAHs should be attributed to three reasons. First, O2 could compete with NO2 for the available sites on PAHs. Second, the quenching of the triple excited state of PAHs (3PAHs*) by O2 inhibited the NO2 uptake. Third, NO3 formed under aerobic conditions reduced the conversion efficiency of NO2 to HONO. The environmental implications suggested that the NO2 uptake on PAHs could contribute to a HONO source strength of 10–120 ppt h−1 in the atmosphere.

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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported by the National Natural Science Foundation of China [grant number 42077198 and 22206023]; the LiaoNing Revitalization Talents Program [grant number XLYC1907185]; the Fundamental Research Funds for the Central Universities [grant numbers N2025011 and N2224002-08]; Open program of Liaoning Provincial Key Laboratory of Urban Atmospheric Environmental Pollution Prevention and Control [grant number 05030102].

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Wangjin Yang: Data curation, Writing—Original Draft preparation, Funding acquisition.

Jiaqi Shang: Investigation.

Xiangli Nan: Resources, Funding acquisition.

Tao Du: Resources.

Chong Han: Project administration, Writing—Review & Editing, Supervision, Funding acquisition.

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Correspondence to Chong Han.

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Yang, W., Shang, J., Nan, X. et al. Unveiling the effect of O2 on the photochemical reaction of NO2 with polycyclic aromatic hydrocarbons. Environ Sci Pollut Res 30, 119838–119846 (2023). https://doi.org/10.1007/s11356-023-30289-y

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  • DOI: https://doi.org/10.1007/s11356-023-30289-y

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