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Siren warning 

Siren warning 

The sirens in Denmark are used to warn the public in case of major emergencies that require people to go indoors to avoid being affected by e.g. chemical gasses, radiation or hazardous smoke.
The sirens are able to warn the entire population in one operation but can also be used regionally or locally so as to warn
specific areas.

Yearly test of the sirens
Once every year - on the first Wednesday of May - the sirens are tested. The test starts at noon and lasts for around 10 minutes. If you hear the sirens on the first Wednesday of May, do not be alarmed, it is just a test.


Signal 1- Go indoors - seek information

Signal 1 - Go indoors

The tone will rise quickly and fall again slowly. The signal lasts for 45 seconds.

When you hear the signal:

  • Go indoors
  • Make sure that the people around you know how to react

Listen to the radio, watch TV (DR or TV2). Here you will be told what to do - for example, in connection with a nuclear incident, chemical release, or flood.

 House - indoors

Listen to the radio

Signal 2 - Danger is over

Signal - Danger is over

One long tone lasting 45 seconds.

When you hear the signal:

  • You may now leave the indoor protection
  • You can return to your daily chores

 House - outdoors
Stationary sirens

Sirens are installed in areas having more than 1,000 inhabitants.

 Stationary siren
In areas without sirens

Here the alarm will be sounded by mobile sirens mounted on police cars.

 Mobil siren
Listen to the signals.
Last updated 2019-03-22 - 12:46


statonary siren
The stationary sirens are either mounted on rooftops or, as in this case, on masts.


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