Measurement report: Anthropogenic activities reduction suppresses HONO formation: direct evidence for secondary pollution control
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Le résumé fourni par la source
Nitrous acid (HONO) is a key precursor of atmospheric hydroxyl radicals (OH) and significantly influences the formation of secondary pollutants, making it essential for understanding and controlling air pollution. While many studies have focused on its formation mechanisms, few have explored the impact of variations in anthropogenic activities on HONO formation. Therefore, we investigated the impact of variations in anthropogenic activities on HONO formation based on comprehensive observations conducted in urban Beijing during autumn and winter of 2022. During clean periods with a 53 % drop in Traffic Performance Index, HONO, CO, and NO 2 levels decreased by 2–3 times compared to polluted periods and significantly lower than previously reported wintertime levels in Beijing. Source apportionment revealed that NO 2 heterogeneous reaction on ground was the dominant HONO source across all periods. Vehicle emissions contributed more to HONO during clean periods, suggesting that reducing anthropogenic activities has a stronger influence on secondary HONO formation. Particulate nitrate (pNO 3 ) photolysis contributed more to HONO during polluted periods, due to higher pNO 3 fractions in PM 2.5 under more polluted conditions. Despite including all known formation pathways in the model, unidentified HONO sources still remained. This was strongly associated with intense solar radiation and high OH concentrations at daytime, as well as elevated NH 3 concentrations at nighttime. Emission reduction simulations further revealed that a 50 % NO x reduction during polluted periods could lower HONO by up to 46.3 %, directly demonstrating that reducing anthropogenic activities significantly suppresses HONO formation and provides a scientific basis for the development of air pollution control strategies.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Measurement report: Anthropogenic activities reduction suppresses HONO formation: direct evidence for secondary pollution control
- Date Crossref
- 25/11/2025
- Éditeur
- Copernicus GmbH
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Chinese Academy of Sciences pays non établi dans la noticeOrganisme public
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Beijing National Laboratory for Molecular Sciences pays non établi dans la noticeStructure de recherche
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University of Chinese Academy of Sciences pays non établi dans la noticeUniversité ou école supérieure
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Beijing Research Institute of Mechanical and Electrical Technology pays non établi dans la noticeStructure de recherche
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Minzu University of China pays non établi dans la noticeUniversité ou école supérieure
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State Key Joint Laboratory of Environment Simulation and Pollution Control pays non établi dans la noticeStructure de recherche
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Beijing University of Technology pays non établi dans la noticeUniversité ou école supérieure
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State Key Laboratory for Structural Chemistry of Unstable and Stable Species pays non établi dans la noticeStructure de recherche
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Institute of Chemistry (Beijing pays non établi dans la noticeStructure de recherche
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College of Life and Environmental Sciences NEAC Key Laboratory of Ecology and Environment in Minority Areas pays non établi dans la noticeUniversité ou école supérieure
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College of Environmental Sciences and Engineering State Key Joint Laboratory of Environmental Simulation and Pollution Control pays non établi dans la noticeUniversité ou école supérieure
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Faculty of Environment Science and Engineering Key Laboratory of Beijing on Regional Air Pollution Control pays non établi dans la noticeUniversité ou école supérieure
Chinese Academy of Sciences, Beijing National Laboratory for Molecular Sciences et University of Chinese Academy of Sciences, avec 9 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.