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[Case Analysis of Heavy Air Pollution Process in Xi'an Using Multi-source Data].

Nan Wang1,2,3, Yu-Xing Gao4, Yao Qu2,3

  • 1Xi'an Institute for Innovative Earth Environment Research, Xi'an 710061, China.

Huan Jing Ke Xue= Huanjing Kexue
|October 12, 2023
PubMed
Summary

Xi'an's heavy air pollution in January 2019 resulted from adverse weather and feedback loops. Pollutant accumulation worsened inversions and humidity, driving secondary particle formation and impacting visibility.

Keywords:
PM2.5atmospheric vertical propertieschemical componentsformation mechanismheavy pollutionweather conditions

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Area of Science:

  • Atmospheric Science
  • Environmental Science
  • Chemistry

Context:

  • Xi'an faces persistent air pollution challenges.
  • A severe pollution event occurred in January 2019.
  • Investigated using multi-source data and methods like material balance and sulfur/nitrogen oxidation rate (SOR/NOR).

Purpose:

  • To investigate the formation mechanism of a heavy pollution episode in Xi'an.
  • To analyze the interaction between meteorological conditions and air pollution.
  • To identify the primary chemical components contributing to PM2.5 and visibility reduction.

Summary:

  • The pollution event had three phases: accumulation, maintenance, and dispersion.
  • Adverse weather conditions (stable atmosphere, limited diffusion) and feedback effects were primary causes.
  • Pollutant accumulation led to temperature inversions, decreased mixing layer height, and increased humidity, promoting secondary aerosol formation and growth.

Impact:

  • Secondary inorganic ions (SNA) and other components dominated PM2.5 during peak pollution.
  • Secondary formation significantly impacted both heavy pollution events and visibility.
  • Strong cold air facilitated pollutant dispersion during the final phase.