Analysis of a synergistic pollution process of PM2.5 and ozone
in Beijing-Tianjin-Hebei Region

doi:10.3969/j.issn.1673-6141.2024.03.007

Abstract

Abstract: A synergistic pollution process of PM2.5 and ozone (O3) occurred in Beijing-Tianjin-Hebei Region, China, from April 16 to 22, 2018. In order to gain a deeper understanding of the occurrence and the causes of the synergetic pollution, multi-source data were used to comprehensively analyze the meteorological elements, ground conditions and vertical characteristics of this synergistic process, and according to the hourly mass concentration changes of the two pollutants, the pollution process was divided into three processes: growth, high level, and decline. The results show that: (1) There is a good corresponding relationship between the air temperature, air pressure, relative humidity and pollutant mass concentration change during the pollution process, the wind speed changes significantly during the conversion of different processes, and O3 pollution occurs most at 16:00 every day. (2) When the Mongolian low pressure is near the Beijing-Tianjin-Hebei Region and the Beijing-Tianjin-Hebei Region is on the periphery of the high pressure, pollutants are easy to accumulate and transmit in the static weather. After the transit of the cold front, the mass concentration of pollutants drops rapidly, and the air quality is higher under the control of northeast high pressure. (3) The vertical distribution of aerosols in the early morning of April 19 mainly included mixed and sand dust aerosols, with pollutants mainly coming from the south and southwest of Beijing-Tianjin-Hebei Region, while at noon of April 19, the vertical distribution of aerosols mainly included mixed type, pollution type and sand dust type aerosols, with pollutants mainly coming from the north of Beijing-Tianjin-Hebei Region. High altitude transmission is easy to bring sand dust aerosols, and when the ground pollution is serious, the surface air mass transmission is mainly external horizontal transmission. (4) The hourly average mass concentration of PM2.5 is extremely significantly positively correlated with air temperature, significantly positively correlated with relative humidity, while extremely significantly negatively correlated with air pressure and wind speed. The hourly average mass concentration of ozone shows an extremely significant positive correlation with air temperature and wind speed, and an extremely significant negative correlation with air pressure and relative humidity. There is a significant positive correlation between PM2.5 and O3, and the high hourly mass mass concentrations of the two pollutants mostly occur in the southeast to southwest wind range with the wind directions from 135° to 225°.

Key words: PM2.5, ozone, synergetic pollution, Beijing-Tianjin-Hebei Region

CLC Number:

FANG Wensheng , CAO Nianwen , SHI Xinchi. Analysis of a synergistic pollution process of PM2.5 and ozone in Beijing-Tianjin-Hebei Region[J]. Journal of Atmospheric and Environmental Optics, 2024, 19(3): 342-356.

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Analysis of a synergistic pollution process of PM2.5 and ozone in Beijing-Tianjin-Hebei Region

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