沙尘暴蓝色预警：河南安徽江苏等16省区市部分地区有扬沙或浮尘

Core Viewpoint - The Central Meteorological Observatory has issued a blue warning for sandstorms due to strong winds from cold air, predicting dust or floating dust weather in various regions from February 22 to February 23 [1]. Group 1: Weather Impact - Affected areas include southern Xinjiang Basin, central and eastern Gansu, Ningxia, northern and central Shaanxi, southern Shanxi, southern Hebei, southern Shandong, Henan, northern Hubei, northern Jiangxi, Anhui, Jiangsu, Shanghai, northern Zhejiang, southern Jilin, and northern Liaoning [1]. Group 2: Defense Guidelines - Recommendations include preparing for wind and sand, closing doors and windows, and using masks or scarves to protect against dust [3]. - It is advised to secure temporary structures and outdoor items that may be affected by the sandstorm [3]. - Drivers should control their speed due to low visibility to ensure safety [3].