What to do when your smoke alarm goes off?

Smoke Alarm Emergency

When your smoke alarm goes off, evacuate the building immediately and call emergency services.

Final answer: When your smoke alarm goes off, evacuate the building immediately and call emergency services.

Explanation: When your smoke alarm goes off, it typically means that there is a potential fire or smoke in your home. The first and most important thing to do is to evacuate the building immediately. Make sure everyone in the house is aware of the alarm and leave quickly and safely. Once outside, call the emergency services to report the incident and wait for further instructions.