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Remote Sensing Technology and Application  2022, Vol. 37 Issue (2): 424-435    DOI: 10.11873/j.issn.1004-0323.2022.2.0424
    
PM2.5 Remote Sensing Retrieval and Change Analysis in Beijing-Tianjin-Hebei Region based on Random Forest Model
Xinli Kang1,2(),Wenghao Zhang1,2(),Yuanping Liu1,2,Xingfa Gu3,Tao Yu3,Lili Zhang3,Huakun Xu1,2
1.School of Remote Sensing and Information Engineering，North China Institute of Aerospace Engineering，Langfang 065000，China
2.Heibei Spacer Remote Sensing Information Processing and Application of Collaborative Innovation Center，Langfang 065000，China
3.National Engineering Laboratory for Satellite Remote Sensing Applications，Aerospace Information Research Institute，Chinese Academy of Sciences，Beijing 100094，China
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Abstract  

Atmospheric fine particulate matter PM2.5 is the main atmospheric environmental pollutant that affects human living environment and health. It is of great significance to study the seasonal variation and spatial distribution characteristics of PM2.5 mass concentration for the prevention and treatment of air pollutants. In this study， the MODIS L2 AOD products， MERRA-2 meteorological data and the PM2.5 measured data from ground stations from 2018 to 2020 were used to build the AOD-PM2.5 inversion model based on the improved random forest algorithm. The PM2.5 in Beijing-Tianjin-Hebei region was estimated， and the spatial distribution characteristics and seasonal variation of PM2.5 mass concentration were analyzed. The results showed that： （1） The mean values of determination coefficients （R2） of spring， summer， autumn and winter model were 0.78， 0.66， 0.83 and 0.83， respectively. And the accuracy of simulation is higher.（2） The PM2.5 concentrations of spring， summer， autumn and winter in Beijing-Tianjin-Hebei region from 2018 to 2020 showed significant spatial distribution characteristics and seasonal variation. The maximum of PM2.5 concentrations occurred in winter and the minimum value appeared in summer. （3） Compared with the same season over the years， the PM2.5 pollution range and PM2.5 concentration in the Beijing-Tianjin-Hebei region have improved. Compared with 2018 and 2019， the PM2.5 pollution range in spring and autumn of 2020 improved significantly.
Key words:  PM2.5      Random Forest      MODIS      MERRA-2      Beijing-Tianjin-Hebei     
Received:  07 June 2021      Published:  17 June 2022
ZTFLH:  P407  
Corresponding Authors:  Wenghao Zhang     E-mail:  kang.xinl@qq.com;zhangwh@radi.ac.cn
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Xinli Kang
Wenghao Zhang
Yuanping Liu
Xingfa Gu
Tao Yu
Lili Zhang
Huakun Xu

Cite this article: 

Xinli Kang,Wenghao Zhang,Yuanping Liu,Xingfa Gu,Tao Yu,Lili Zhang,Huakun Xu. PM2.5 Remote Sensing Retrieval and Change Analysis in Beijing-Tianjin-Hebei Region based on Random Forest Model. Remote Sensing Technology and Application, 2022, 37(2): 424-435.

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http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2022.2.0424     OR     http://www.rsta.ac.cn/EN/Y2022/V37/I2/424

Fig.1  Distribution map of ground stations in Beijing-Tianjin-Hebei region from 2018 to 2020
Fig.2  Inversion of PM2.5 concentration flow chart in Beijing-Tianjin-Hebei region
Fig.3  Statistical chart of dependent and independent variables
Fig.4  Parameter optimization of the number and the maximum depth of decision trees
Fig.5  Accuracy evaluation for random forest model
Fig.6  The inversion results in some single days
Fig.7  Seasonal average results of PM2.5 during 2018~2020
Fig.8  Statistical chart of PM2.5’s seasonal mean value during 2018~2020
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