Spatial and Seasonal Dynamics of Air Quality in the Beijing-Tianjin-Hebei Region: An Analysis Using K-means Clustering and BP Neural Networks Journal title: Opportunities and Challenges in Sustainability Authors: Yuanyuan Wang, Zhuang Wu, Wanshu Fu, Jiaqi Du, Yi Zhang Subject(s): Environmental Sciences, Environmental Economics, Ecology, Global Environmental Change, Environmental Planning, Environmental Protection, Green & Sustainable Science & Technology