Most air defense alarms are set in high places to achieve the best sound transmission effect. Generally speaking, the sound radiation radius of air defense alarm is 400 meters to 500 meters. In urban areas, because of the high-rise buildings, the sound wave between two air defense alarms can cover 1 km, so the volume of air defense alarms is about 120 dB to 130 dB.

For more information about air defense alarm decibels, please visit:/ask/f7c6781615825924.html? Zd view more content