Core Viewpoint - The article discusses the ongoing foggy weather conditions affecting several regions in China, particularly in Beijing, Tianjin, and Hebei, with visibility dropping below 200 meters in some areas. The article also explores the reasons behind the recurrence of fog and its expected duration. Group 1: Weather Warnings and Conditions - The Central Meteorological Observatory issued a yellow fog warning, predicting dense fog in southeastern Beijing, central Tianjin, central Hebei, western and southern Shandong, northern Jiangsu, northern Anhui, and central Hunan, with visibility potentially below 200 meters [1][3] - The recent fog events are attributed to a pattern of cold air activity interspersed with moist conditions, which has led to three significant fog occurrences since autumn, primarily in the Beijing-Tianjin-Hebei region [3][5] Group 2: Impact on Transportation - Foggy weather significantly impacts transportation, particularly on highways where "tuanwu" (group fog) is common, especially in the North China Plain, Jiangsu, and Anhui regions [7] - The latest forecast indicates that the current foggy conditions will persist until the 8th, with a cold air front expected to move eastward on the 9th, gradually reducing the fog [9]