The chemical characteristics and sources of formaldehyde on O3 and non-O3 polluted days in Wuhan, central China

IF 4.2 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Atmospheric Environment Pub Date : 2024-09-12 DOI:10.1016/j.atmosenv.2024.120809

Haibin Huang , Chunmian Yang , Zhaoqi Wang , Shize Lian , Xiaoxiao Li , Yanqun Liu , Hairong Cheng

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Abstract

In August 2023, a detailed investigation of formaldehyde (HCHO) chemical characteristics on ozone (O₃) polluted days and non-O₃ polluted days in Wuhan was undertaken. The mean value of HCHO on O₃ polluted days (3.02 ± 1.15 ppbv) was 122% higher than that on non-O₃ polluted days (1.35 ± 0.41 ppbv). Utilizing Positive Matrix Factorization (PMF) model revealed secondary formation as the dominant HCHO source (58.3% on non-O₃ polluted days and 66.2% on O₃ polluted days). On O₃ polluted days, the contribution of liquefied petroleum gas (LPG)/solvent usage and industrial emissions to HCHO were 13.7% and 8.2%, respectively, whereas on non-O₃ polluted days, LPG/solvent use and diesel exhaust contributed 15.4% and 14.7%, respectively. The top ten species, with the highest Relative Incremental Reactivity (RIR) to HCHO, were mainly alkenes and aromatics, which remained consistent on both O₃ and non-O₃ polluted days. It is noteworthy that the RIR of isobutane to HCHO is significant in this study. Further reapportionment of secondary HCHO by a photochemical box model indicated that LPG/solvent usage (33.2%) contributed the most to HCHO on O₃ polluted days, while diesel exhaust (31.9%) dominated on non-O₃ polluted days. This research enhances understanding of HCHO in Wuhan, providing a theoretical basis for targeted pollution reduction and supporting efforts to improve air quality and public health.

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华中地区武汉市 O3 和非 O3 污染日的甲醛化学特征及来源

2023 年 8 月，对武汉市臭氧（O3）污染日和非 O3 污染日的甲醛（HCHO）化学特征进行了详细调查。O3 污染日的 HCHO 平均值（3.02 ± 1.15 ppbv）比非 O3 污染日的 HCHO 平均值（1.35 ± 0.41 ppbv）高出 122%。正矩阵因式分解（PMF）模型显示，二次生成是 HCHO 的主要来源（在非 O3 污染日为 58.3%，在 O3 污染日为 66.2%）。在 O3 污染日，液化石油气/溶剂使用和工业废气对 HCHO 的贡献分别为 13.7% 和 8.2%，而在非 O3 污染日，液化石油气/溶剂使用和柴油废气对 HCHO 的贡献分别为 15.4% 和 14.7%。与 HCHO 的相对增量反应性（RIR）最高的前十个物种主要是烯烃和芳烃，这在 O3 和非 O3 污染日均保持一致。值得注意的是，在这项研究中，异丁烷与 HCHO 的相对增量反应活性很高。光化学箱模型对二次 HCHO 的进一步重新分配表明，在 O3 污染日，液化石油气/溶剂的使用（33.2%）对 HCHO 的贡献最大，而在非 O3 污染日，柴油废气（31.9%）则占主导地位。这项研究加深了人们对武汉市 HCHO 的了解，为有针对性地减少污染提供了理论依据，有助于改善空气质量和公众健康。

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来源期刊

Atmospheric Environment 环境科学-环境科学

CiteScore

9.40

自引率

8.00%

发文量

458

审稿时长

53 days

期刊介绍： Atmospheric Environment has an open access mirror journal Atmospheric Environment: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Atmospheric Environment is the international journal for scientists in different disciplines related to atmospheric composition and its impacts. The journal publishes scientific articles with atmospheric relevance of emissions and depositions of gaseous and particulate compounds, chemical processes and physical effects in the atmosphere, as well as impacts of the changing atmospheric composition on human health, air quality, climate change, and ecosystems.