北京升级发布暴雨红色预警，启动防汛一级应急响应

Core Viewpoint - Beijing has issued a red rainstorm warning and initiated a level one emergency response, urging citizens to avoid unnecessary outings and take safety precautions [2][3]. Group 1: Emergency Measures - The city has advised that non-essential employees should not report to work, except for those involved in essential city operations and public services [5]. - All schools have suspended in-person classes and outdoor teaching activities, while training institutions have halted all offline training sessions [5]. - Outdoor tourism activities in mountainous and water-related areas are prohibited, and all scenic spots, parks, and homestays are closed [5][6]. Group 2: Safety Precautions - Residents in vulnerable areas such as old houses, low-lying courtyards, and underground spaces are advised to closely monitor the risk of flooding and evacuate if necessary [6]. - All underground businesses are required to cease operations, and construction sites must stop work and ensure the safe relocation of personnel [6][5]. - Individuals in at-risk areas are instructed to comply with evacuation orders and not return without permission [3].