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<p>Ultra-high-resolution mass spectrometry was used to investigate the characterization of aerosol organonitrates (ONs). ONs featured high-molecular-weight (HMW), high unsaturation, and high functionalization. Under high air pollution events, the number of N<sub>1</sub>O<sub>x</sub> class ONs composed of aliphatic and aromatic compounds increased with high levels of oxidation. In the daytime, highly unsaturated aliphatic-ONs were continuously produced. In the nighttime, the atmospheric oxidation of NO<sub>3</sub> radicals promoted ONs. N<sub>2</sub>O<sub>x</sub> class ONs were mainly comprised of multi-generation oxidated aliphatic compounds with high unsaturation. Most of the N<sub>2</sub>O<sub>x</sub>-ONs were from cooking. Biomass burning also played an indelible role in the formation of ONs. In the daytime, atmospheric photodegradation led to the removal of the HMW ONs, especially aliphatic ONs. During nighttime, the NO<sub>3</sub> oxidation radicals inhibited the generation of ONs, especially anthropogenic ONs. This study improves the understanding of the source, formation, and evolution of HMW ONs under the demand for continuous PM mitigation.</p>

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Evolution of atmospheric high-molecular-weight Organonitrates (HMW ONs) in urban Yangtze River Delta (YRD), China

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月14日

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  • Yang Du,
  • Hanxiong Che,
  • Zier Bao,
  • Yiliang Liu,
  • Qing Li,
  • Miao Hu,
  • Jiawei Zhou,
  • Shumin Zhang,
  • Xiaojiang Yao,
  • Quan Shi,
  • Chunmao Chen,
  • Yan Han,
  • Lingshuo Meng,
  • Xin Long,
  • Xin Qi,
  • Chen He,
  • Yang Chen

摘要

Ultra-high-resolution mass spectrometry was used to investigate the characterization of aerosol organonitrates (ONs). ONs featured high-molecular-weight (HMW), high unsaturation, and high functionalization. Under high air pollution events, the number of N1Ox class ONs composed of aliphatic and aromatic compounds increased with high levels of oxidation. In the daytime, highly unsaturated aliphatic-ONs were continuously produced. In the nighttime, the atmospheric oxidation of NO3 radicals promoted ONs. N2Ox class ONs were mainly comprised of multi-generation oxidated aliphatic compounds with high unsaturation. Most of the N2Ox-ONs were from cooking. Biomass burning also played an indelible role in the formation of ONs. In the daytime, atmospheric photodegradation led to the removal of the HMW ONs, especially aliphatic ONs. During nighttime, the NO3 oxidation radicals inhibited the generation of ONs, especially anthropogenic ONs. This study improves the understanding of the source, formation, and evolution of HMW ONs under the demand for continuous PM mitigation.