Forecast of the trend of heavy fog based on the VARIMAX model Boyang Peng, Yuchi Meng, Dapai Shi, Mingyu Dai, Hao Zhou and Tingxuan Chen E3S Web Conf., 257 (2021) 03013 Published online: 12 May 2021 DOI: 10.1051/e3sconf/202125703013