On the morning of September 18th
Author:Shanxi Economic Daily Time:2022.09.11
September 18, 2021 from 10:00 am to 10:15 am
Taiyuan City conducted a unified test of air defense alerts
The signal of the anti -air warning of the testing is
Pre -alert, air strike alert, lifting alarm
Pre -alert: 36 seconds, stop 24 seconds, repeated 3 times as a cycle
Air strike alert: 6 seconds, stop 6 seconds, repeated 15 times as a cycle
Lift alarm: 180 seconds in a row
The interval between each air defense alert is 3 minutes
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