Effect of Biomass Burning, Diwali Fireworks, and Polluted Fog Events on the Oxidative Potential of Fine Ambient Particulate Matter in Delhi, India,Environmental Science & Technology

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Effect of Biomass Burning, Diwali Fireworks, and Polluted Fog Events on the Oxidative Potential of Fine Ambient Particulate Matter in Delhi, India
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-09-26 , DOI: 10.1021/acs.est.2c02730
Joseph V Puthussery _{1,

2} , Jay Dave _{3,

4} , Ashutosh Shukla ₅ , Sreenivas Gaddamidi ₅ , Atinderpal Singh _{3,

6} , Pawan Vats ₇ , Sudheer Salana ₁ , Dilip Ganguly ₇ , Neeraj Rastogi ₃ , Sachchida Nand Tripathi ₅ , Vishal Verma ₁

Affiliation

We investigated the influence of biomass burning (BURN), Diwali fireworks, and fog events on the ambient fine particulate matter (PM_2.5) oxidative potential (OP) during the postmonsoon (PMON) and winter season in Delhi, India. The real-time hourly averaged OP (based on a dithiothreitol assay) and PM_2.5 chemical composition were measured intermittently from October 2019 to January 2020. The peak extrinsic OP (OP_v: normalized by the volume of air) was observed during the winter fog (WFOG) (5.23 ± 4.6 nmol·min^–1·m^–3), whereas the intrinsic OP (OP_m; normalized by the PM_2.5 mass) was the highest during the Diwali firework-influenced period (29.4 ± 18.48 pmol·min^–1·μg^–1). Source apportionment analysis using positive matrix factorization revealed that traffic + resuspended dust-related emissions (39%) and secondary sulfate + oxidized organic aerosols (38%) were driving the OP_v during the PMON period, whereas BURN aerosols dominated (37%) the OP_v during the WFOG period. Firework-related emissions became a significant contributor (∼32%) to the OP_v during the Diwali period (4 day period from October 26 to 29), and its contribution peaked (72%) on the night of Diwali. Discerning the influence of seasonal and episodic sources on health-relevant properties of PM_2.5, such as OP, could help better understand the causal relationships between PM_2.5 and health effects in India.

中文翻译：

印度德里生物质燃烧、排灯节烟花和污染雾事件对精细环境颗粒物氧化潜力的影响

我们调查了印度德里后季风 (PMON) 和冬季期间生物质燃烧 (BURN)、排灯节烟花和雾事件对环境细颗粒物 (PM _{2.5 ) 氧化电位 (OP) 的影响。}从 2019 年 10 月到 2020 年 1 月间断测量实时每小时平均 OP（基于二硫苏糖醇测定）和 PM _{2.5化学成分。在冬季雾期间观察到峰值外在 OP（OP}_v：由空气体积标准化） (WFOG) (5.23 ± 4.6 nmol·min ^–1 ·m ^–3 )，而内在 OP (OP _m ; 由 PM _2.5质量归一化) 在排灯节烟花影响期间最高 (29.4 ± 18.48 pmol·min^–1 ·μg ^–1 )。使用正矩阵分解的源分配分析表明，交通 + 重悬浮粉尘相关排放 (39%) 和二级硫酸盐 + 氧化有机气溶胶 (38%)在 PMON 期间推动了 OP _v ，而 BURN 气溶胶占主导地位 (37%) WFOG 期间的OP _{v 。}在排灯节期间（10 月 26 日至 29 日的 4 天期间），与烟花相关的排放成为 OP _{v的重要贡献者（~32%），其贡献在排灯节之夜达到峰值（72%）。}辨别季节性和偶发性来源对 PM _2.5的健康相关特性的影响，例如 OP，有助于更好地理解 PM _{2.5之间的因果关系}和对印度的健康影响。

更新日期：2022-09-26

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