Yingxiao Tang1,2, Suqin Han  1,2, Qing Yao1,2, Ziying Cai1,2, Yulu Qiu3, Jin Feng4

1 Tianjin Environmental Meteorological Center, Tianjin 300074, China
2 CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research, Tianjin 300074, China
3 Environmental Meteorology Forecast Center of Beijing-Tianjin-Hebei, Beijing 100089, China
4 Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China

Received: December 16, 2019
Revised: March 19, 2020
Accepted: April 19, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.2019.11.0567


Cite this article:

Tang, Y., Han, S., Yao, Q., Cai, Z., Qiu, Y. and Feng, J. (2020). Analysis of a Severe Regional Haze-fog-dust Episode over North China in Autumn by Using Multiple Observation Data. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.2019.11.0567


HIGHLIGHTS

  • Analysis of haze-fog-dust event could improve the understanding of air pollutions.
  • The cold air with dust did not improved air quality in southern part of north China.
  • The dust might promote the fine particle production in downstream area.
 

ABSTRACT


The mixing of dust and haze is an important factor in the variation of fine particles. In this study, multiple observation data were used to analyze the characteristics and formation of a haze-fog-dust event that occurred in North China between November 23 and November 30 of 2018. This episode can be roughly divided into two stages, haze-fog and dust, with the transition occurring on November 27. Our analysis shows that stable weather conditions and temperature inversions in North China caused the haze-fog event (November 23–26), during which the PM2.5 concentration gradually increased. After November 27, the arrival of cold air accompanied by dust activity rendered meteorological conditions favorable to air quality in the northern part but not the central or southern part of North China. Instead, continuous adverse conditions and the dust backflow, which trapped dust aerosols in the southern part of North China for nearly two days, were responsible for high PM2.5 concentrations in Jinan and Zhengzhou after November 27 (146 and 156 µg m–3 vs. 114 and 144 µg m–3 before November 27, respectively). This study highlights the effect of dust transport on regional environmental pollution during the autumn and the winter.


Keywords: Air pollution; Haze; Dust; Atmospheric aerosols; Fine particles.


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