During January of 2018,heavy air pollution episodes occurred in central and eastern China.This study comprehensively analyzed the meteorological conditions,characteristics,and formation causes of a heavy air pollution episode during January 18-22,2018.The results showed that the hourly averaged concentration of PM_2.5 was greater than 150 μg/m³ in Wuhan.The main change in PM_2.5 was for particles less than 0.5 μm during the pollution process,winds.In addition to adverse weather conditions,motor vehicle and coal emissions were the most important causes of heavy air pollution,and regional transport from Henan,Anhui,Huanggang,and other cities affected Wuhan significantly.