Exploring air pollution characteristics from spatio-temporal perspective: A case study of the top 10 urban agglomerations in China

• Published in: Environmental research 2023-05, Vol.224, p.115512-115512, Article 115512
• Main Authors: Han, Jiakuan, Yang, Yi, Yang, Xiaoyue, Wang, Dongchao, Wang, Xiaolong, Sun, Pengqi
• Format: Article
• Language: English
• Subjects: Air Pollutants - analysis; Air pollution; Air Pollution - analysis; China; Cities; Environmental Monitoring - methods; GTWPCA; Particulate Matter - analysis; Spatiotemporal analysis; STCA; Urban agglomerations; Urbanization
• ISSN: 0013-9351; 1096-0953
• DOI: 10.1016/j.envres.2023.115512

Air pollution has become a global public health risk factor as rapid urbanization advances. To observe the air pollution situation, air monitoring stations have been established in many cities, which record six air pollutants. Previous studies have identified cities exhibiting similar air pollution characteristics by combining principal component analysis (PCA) with cluster analysis (CA). However, spatial and temporal effects were neglected. In this paper, we focus on the combination of GTWPCA and STCA, which fully incorporates spatio-temporal effects. It is then applied to air pollution data from the top 10 urban agglomerations in China during 2016–2021. Key experimental findings include: 1. GTWPCA provides a more detailed interpretation of local variation than PCA. 2. Compared with CA, STCA highlights the coupling effect in the spatial and temporal dimensions. 3. The combination of GTWPCA and STCA captures similar air pollution characteristics from spatio-temporal perspectives, which has the potential to help environmental authorities take further action to control air pollution. •Proposed new framework combining GTWPCA and STCA.•Identified the main air pollutants at spatial and temporal locations.•Captured similar air pollution behavior over space and time.