Spatiotemporal variations and sources of PM2.5 in the Central Plains Urban Agglomeration, China
- 6 July 2022
- journal article
- research article
- Published by Springer Science and Business Media LLC in Air Quality, Atmosphere & Health
- Vol. 15 (9), 1507-1521
- https://doi.org/10.1007/s11869-022-01178-z
Abstract
The Central Plains Urban Agglomeration (CPUA) is the largest region in central China and suffers from serious air pollution. To reveal the spatiotemporal variations and the sources of fine particulate matter (PM2.5, with an aerodynamic diameter of smaller than 2.5 μm) concentrations of CPUA, multiple and transdisciplinary methods were used to analyse the collected millions of PM2.5 concentration data. The results showed that during 2017 ~ 2020, the yearly mean concentrations of PM2.5 for CPUA were 68.3, 61.5, 58.7, and 51.5 μg/m3, respectively. The empirical orthogonal function (EOF) analysis suggested that high PM2.5 pollution mainly occurred in winter (100.8 μg/m3, 4-year average). The diurnal change in PM2.5 concentrations varied slightly over the season. The centroid of the PM2.5 concentration moved towards the west over time. The spatial autocorrelation analysis indicated that PM2.5 concentrations exhibited a positive spatial autocorrelation in CPUA. The most polluted cities distributed in the northern CPUA (Handan was the centre) formed a high-high agglomeration, and the cities located in the southern CPUA (Xinyang was the centre) formed a low-low agglomeration. The backward trajectory model and potential source contribution function were employed to discuss the regional transportation of PM2.5. The results demonstrated that internal-region and cross-regional transport of anthropogenic emissions were all important to PM2.5 pollution of CPUA. Our study suggests that joint efforts across cities and regions are necessary.Keywords
Funding Information
- Program for Innovative Research Team (in Science and Technology) in University of Henan Province (22IRTSTHN010)
- Key Science and Technology Research Project of Henan Province of China (18A170013)
- Nanhu Scholars Program for Young Scholars of Xinyang Normal University
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