北京：市民非必要不外出！非必要不要求到岗上班！

Group 1 - The Beijing Municipal Emergency Management Bureau issued a red rainstorm warning, predicting rainfall of over 150mm in most areas and up to 300mm in some locations from 20:00 on July 28 to 07:00 on July 29 [2] - The warning indicates a high risk of mountain torrents, mudslides, and landslides in mountainous and shallow mountainous areas, with severe waterlogging expected in low-lying areas [2][10] - All underground business venues are required to suspend operations, and construction sites are to halt work [7] Group 2 - Schools are to stop offline teaching and outdoor activities, while training institutions must cease offline training [5] - Citizens are advised to avoid unnecessary outings, and companies are not required to have employees report to work unless essential for city operations and public services [4] - Residents in low-lying areas, old houses, and underground rooms should closely monitor the risk of flooding and take timely precautions [6]