On May 15, 2020, a SDS event has occurred in Central Mongolia and this will make an impact on the areas of central part of Inner Mongolia in China and some areas in the Northern China Plain in the next two days. WMO SDS-WAS Beijing Dust Operational Forecasting  Centre  forecast that the city of Beijing will be affected from noon of May 16, The figure below shows the SDS observation of FY-4 geostationary satellite.