Non-methane volatile organic compounds (NMVOCs) play a crucial role in atmospheric chemistry of ozone formation potential (OFP), secondary organic aerosol formation potential (SOAFP), and reactivity of OH ion (L). We have estimated L, OFP, and SOAFP of 25 ambient NMVOC species measured at the CSIR- National Physical Laboratory, New Delhi from February 2022 to February 2023. Alkenes contributed the highest to the OFP (75.63%) and L (68.11%), whereas, aromatics to the SOAFP (81.01%). The source apportionment was performed by positive matrix factorization (PMF) receptor model using the advanced ME-2 engine. Six anthropogenic sources of NMVOCs were identified namely liquified petroleum gas (LPG) + gasoline vehicular emission (GVE), diesel vehicular emission (DVE), painting usage, biomass burning, organic solvent usage, and chemical plant emission respectively. The mixed source (LPG + GVE) is primarily characterized by lower alkanes and aromatics, while DVE is mainly composed of aromatics and higher alkanes. Together, these sources contributed approximately 53% of the total VOCs. Painting usage was dominated by higher alkanes with a contribution of 11.2%, biomass burning is primarily composed of ethane, ethylene, and benzene, contributing 13.54%, and chemical plant emissions are dominated by n-hexane and benzene, contributing 13.78% of the total VOCs. The least contributing source (8.64%) is organic solvent usage, characterized by benzene, isopropyl benzene, and higher alkanes (C and C). Mixed source was the highest contributor to L (42.09%), OFP (58.73%), and SOAFP (58.73%). A recent study underscores the importance of prioritizing reactivity-based strategies, focusing on OFP and SOAFP to control NMVOCs and ozone pollution.

中文翻译：

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NMVOC 源在德里上空 O3、OH 反应性和二次有机气溶胶形成中的作用

非甲烷挥发性有机化合物 (NMVOC) 在臭氧形成潜力 (OFP)、二次有机气溶胶形成潜力 (SOAFP) 和 OH 离子 (L) 反应性的大气化学中发挥着至关重要的作用。我们估算了 2022 年 2 月至 2023 年 2 月在新德里 CSIR 国家物理实验室测量的 25 种环境 NMVOC 物种的 L、OFP 和 SOAFP。烯烃对 OFP (75.63%) 和 L (68.11%) 的贡献最高，而芳香族化合物则占 SOAFP (81.01%)。使用先进的 ME-2 引擎通过正矩阵分解 (PMF) 受体模型进行源分配。确定了六种非甲烷挥发性有机化合物的人为来源，分别是液化石油气（LPG）+汽油车排放（GVE）、柴油车排放（DVE）、油漆使用、生物质燃烧、有机溶剂使用和化工厂排放。混合源（LPG+GVE）主要由低级烷烃和芳烃组成，而DVE主要由芳烃和高级烷烃组成。这些来源合计约占 VOC 总量的 53%。油漆用量以高级烷烃为主，占比11.2%；生物质燃烧以乙烷、乙烯、苯为主，占比13.54%；化工厂排放以正己烷、苯为主，占比13.78%挥发性有机化合物。贡献最少的来源 (8.64%) 是有机溶剂的使用，其特征是苯、异丙苯和高级烷烃（C 和 C）。混合源对 L (42.09%)、OFP (58.73%) 和 SOAFP (58.73%) 的贡献最高。最近的一项研究强调了优先考虑基于反应性的策略的重要性，重点关注 OFP 和 SOAFP 来控制 NMVOC 和臭氧污染。