VMA is used in the event of accidents, serious incidents and disruptions in important societal functions.
It is part of Sweden's crisis preparedness.
Now on Monday, March 7, it's time for this year's first test of the signal.
Which takes place four times a year.
This time the test coincides with the war in Ukraine.
This means that the Swedish Civil Contingencies Agency wants to be extra clear that this is a test and nothing else.
- Considering the external situation, MSB wants to emphasize that Monday's signal is just a test.
We encourage the media to disseminate the information so that the public becomes aware that there is no cause for concern, says Anders Johannesson, unit manager at MSB.
A horn in Kurt Boström's garden
Around Uppsala municipality and in Uppsala county, there are lots of Hesa Fredrik horns placed - in strategically chosen places.
On MSB's website you can see where the horns are located.
One of them is sitting in Kurt Boström's garden in Sunnersta, just south of Uppsala.
It has been sitting there since the 90s.
- It happens that I get scared if I am not prepared for it to sound, says Kurt Boström.
Kurt Boström himself is used to honking - even though this time he can understand that the situation looks a little different.
- If some neighbors get worried on Monday, I have to go out and explain that it is not strange.
Otherwise I will stay inside and close my windows, says Kurt Boström.
In the clip: See the story behind the horn in Kurt Boström's villa garden.