Dutch air raid siren

On the first Monday of each month at 12:00 PM, the Netherlands conducts a test of its public warning sirens. These sirens, totaling around 4,200 across the country, were originally designed as air raid alarms but have since been adapted to signal other types of emergencies as well. During the test, the sirens emit a continuous sound for one minute and 26 seconds. The only exceptions to this routine occur when the first Monday coincides with a national or religious holiday, or Remembrance Day.