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Academic Journal of Environment & Earth Science, 2023, 5(2); doi: 10.25236/AJEE.2023.050209.

Study on the Trend of Atmospheric Air Quality Changes, Pollution Characteristics and Causes in the Chengdu-Chongqing Region in China


Xu Wang1, Liqun Wang1, Lei Gao2, Yuanyuan Cao3

Corresponding Author:
Liqun Wang

1School of Economics and Management, Beijing Forestry University, Beijing, 100083, China

2School of Economics and Management, Yanshan University, Qinhuangdao, 066004, China

3Zhangjiakou City Rural Cooperative Economic Management Station, Zhangjiakou, 075000, China


Based on the air pollutant spatial and temporal data of 16 major cities in the Chengdu-Chongqing region from 2015-2021, using the analysis methods of the spatial autocorrelation model and the characteristic radar chart, this paper analyzes the spatial and temporal characteristics of air pollution in the Chengdu-Chongqing region and the main sources and causes of air pollutants in different cities. The research results show: (1) temporally, the overall air quality in the Chengdu-Chongqing region shows an improving trend from 2015 to 2021, but the pollution is more serious in winter, and the air pollutants fine particulate matter(PM2.5) and sulfur dioxide(SO2) pollution are prominent. (2) Spatially, the spatial distribution pattern of pollutants PM2.5, inhalable particles (PM10), nitrogen dioxide(NO2) and SO2 in Chengdu-Chongqing region shows the distribution characteristics of high in the west and low in the east, while pollutant carbon monoxide(CO) shows the characteristics of high in the east and low in the west. (3) In 2021, the air quality index (AQI index) of cities in Chengdu-Chongqing region show the spatial clustering characteristics of "high - high" and "low - low". (4) The urban air pollution in Chengdu-Chongqing region mainly includes four types: secondary-biased, coal-fired, motor vehicle-biased and dust-biased, among which, coal-fired is the main type of air pollution in Chengdu-Chongqing region.The findings of the study can provide decision support for targeted treatment of air pollution and high-quality economic and social development in the Chengdu-Chongqing region.


Chengdu-Chongqing region; AQI index; air pollution; spatial and temporal characteristics

Cite This Paper

Xu Wang, Liqun Wang, Lei Gao, Yuanyuan Cao. Study on the Trend of Atmospheric Air Quality Changes, Pollution Characteristics and Causes in the Chengdu-Chongqing Region in China. Academic Journal of Environment & Earth Science (2023) Vol. 5 Issue 2: 51-60. https://doi.org/10.25236/AJEE.2023.050209.


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