People who are at risk from incidents at industrial sites in and around Avonmouth will already have warning information leaflets from the operators of the sirens. The area includes Portishead, Avonmouth, Shirehampton, Pilning and Severn Beach.
If you hear the sirens, stay in your home, tune into local radio or TV stations and follow the instructions of the emergency services. The ‘all clear’ message is sounded when it is safe.
The sirens are tested on the third day of each month at 3pm. The test is a three-minute alert warning, one-minute silence and one-minute all clear signal.