昨天，全城鸣响防空警报

Core Insights - The air raid siren test in Nanjing on September 18 was a success, achieving a 100% activation rate across over a thousand sirens and nearly ten thousand emergency broadcast systems [1] - The event served as a comprehensive assessment of the city's early warning capabilities and aimed to enhance public awareness and emergency response skills [1] Group 1: Siren Test and Innovations - The test utilized the "National Emergency Warning Information Release System" and the "My Nanjing" app to disseminate air raid alerts, significantly increasing public awareness and access to warning information [1] - On-site sound intensity tests were conducted in areas with potential weak signal coverage, providing critical data for optimizing siren placement and improving wartime alert effectiveness [1] - IoT technology was employed for real-time monitoring of 40 pilot sirens, enhancing management and data analysis capabilities, and advancing the information technology infrastructure of the warning system [1] Group 2: Civil Defense Drills - The air raid siren test was complemented by multi-subject civil defense drills, involving over ten thousand participants including community residents, students, volunteers, and civil defense professionals [2] - These activities not only strengthened citizens' national defense awareness and civil defense consciousness but also thoroughly tested the reliability of Nanjing's civil defense communication and command control systems [2] - The drills aimed to enhance the civil defense department's ability to execute wartime tasks and protect citizens' lives and property [2]