At 20:00 on January 19, 2025, the Tongliang District Meteorological Observatory in Chongqing issued a yellow warning signal for heavy fog: it is expected that from 5:00 to 10:00 on January 20, fog with a visibility of less than 500 meters may appear in most towns and streets such as Bachuan Street, Dongcheng Street, Nancheng Street, Pulu Street, Jiuxian Street, Weixin Town, Gaolou Town, Anju Town, Baiyang Town, Shuikou Town, Erping Town, Xihe Town, Yongjia Town, Anxi Town, Shuangshan Town, Xiaolin Town, Pingtan Town, and local visibility of less than 200 meters may occur. Please pay attention to prevention. Defense Guide: 1. Pay attention to safety when driving vehicles and engaging in outdoor activities. 2. Airports, highways, water transportation and other units should strengthen traffic management. 3. Relevant departments at all levels shall carry out fog prevention and response work in accordance with their responsibilities.