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| Estimation of fugitive dust emission from construction bare land in Beijing from 2018 to 2022 |
| QIU Yun1,2, LI Jin-xiang1,2, ZHANG Li-kun1,2, LI Ling-jun1,2, LU Hai-feng1,2, JIANG Lei1,2 |
1. Beijing Municipal Ecological and Environmental Monitoring Center, Beijing 100048, China;
2. Beijing Key Laboratory of Atmospheric Particulate Monitoring Technology, Beijing 100048, China |
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Abstract A method was established to obtain the parameters of bare land control rate and estimate construction bare land dust emission by using remote sensing data. The method was applied to the estimation of construction bare land dust pollution emission in Beijing from 2018 to 2022, and the temporal and spatial distribution characteristics and formation causes were analyzed. The results show that the dust emission from construction bare land in Beijing was declining from more than 37000 tons to about 27000 tons from 2018 to 2022. The emission of construction dust decreased the most from 2019 to 2020, by 30%. Spring was the high-value period of fugitive dust emission from construction bare land, and the quarterly mean value of TSP emission from construction bare land was characterized by spring > winter > summer > autumn. The high level of dust emission in 2018was mainly due to the large area of construction bare land and the low bare land control rate at the early time of policy implementation. The main type of construction bare land came from demolition, which was mainly distributed in the southeast and part of urban and rural areas in the southwest, originating from the special action of "relieving, regulating, and promoting improvement" and the implementation of shantytown reconstruction and environmental improvement. The other part of construction bare land came from construction, such as Tongzhou sub-center construction area, Yanqing World Expo Park construction area, and Daxing Airport construction area. From July 2018 to June 2022, the overall downward trend of fugitive dust emissions from construction bare land in Beijing was mainly due to three reasons. First, during the shutdown period, the construction projects strengthened the coverage of bare land. Second, demolition bare land formed by dredging and regulation was transformed into ecological green land. Third, the area of the construction site was greatly reduced, mainly due to the completion of large-scale projects. In addition, affected by the epidemic situation, the overall volume of the construction site has not significantly increased after 2020. The application of control measures has a certain effect on the construction fugitive dust control, and the emission reduction efficiency increased month by month after the application of control measures. The emission reduction rate fluctuated between 12% and 17%, and the remote sensing can be used to achieve precise control of dust sources and strengthen the investigation of the implementation of control measures in construction bare land during the key period of air quality control.
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Received: 25 November 2022
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