沙尘席卷北方多地！景区紧急闭园，冷空气将裹挟沙尘南下

Group 1 - The central meteorological station issued a blue sandstorm warning due to strong winds affecting northern regions of China, with expectations of sand and dust weather from February 22 to February 23 [1][2] - Areas expected to experience sand and dust weather include Xinjiang, Inner Mongolia, Gansu, Ningxia, Shaanxi, Shanxi, and several provinces in eastern China, with specific mention of PM10 pollution levels potentially reaching high values in the Beijing-Tianjin-Hebei region [1][2] - The North Yue Hengshan Scenic Area announced a temporary closure for safety inspections due to extreme weather conditions, highlighting the impact of sandstorms on tourism and local attractions [1] Group 2 - A strong cold air mass is affecting a wide area in northern China, leading to significant temperature drops of 6-10°C in various regions, with some areas experiencing drops exceeding 12°C [2] - The central meteorological station also issued a yellow wind warning, predicting wind speeds of 5-7 levels and gusts reaching 11 levels in certain areas, which could disrupt transportation and outdoor activities [2] - The occurrence of sandstorms is noted to be highest in spring, with data indicating that such weather can occur throughout the year, affecting air travel and leading to the closure of several tourist attractions [2]