Characteristics of Dust Events in China from 2015 to 2020

As the main source of dust in Asia, China often suffers from events. The temporal and spatial characteristics events change with variations geography, climate human activities. Based on criteria selecting proposed recently by Environmental Monitoring Station, hourly concentration PM10 PM2.5 336 cities 2015 to 2020 were used study more accurately objectively. results showed that all clearly decreased, but strong did not decrease. There 334 had except Shenzhen Dongguan, 299 seriously polluted due events, 134 encountered level III 56 IV. high frequencies mainly distributed Northern China, especially Northwest China. contribution was than 10% about 5–10% for PM2.5. most likely month May. starting time bimodally distributed, common 10:00–11:00 BJT, followed 22:00–23:00 BJT. According PSCF (Potential Source Contribution Function) results, potential different came northwest, affected Mongolia addition local In addition, Beijing obviously recirculation. This is great significance improvement forecast weather warning heavy pollution caused