Batteries in smoke detectors should be changed twice a year, it is easy to remember that when you change your clocks to change your smoke detector battery also.
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Keep all windows and doors closed, exit the house and call 911 from a neighbor's house or from your cell phone. Doors and windows are closed so that the fire department can get an actual reading and try to locate the problem. If the house is vented, the fire department will detect lower readings if there is a problem.
Anytime a fire alarm goes off you are to evacuate the building until the fire department arrives on the scene and gives an all clear that the building is safe to return to. Do not reset the alarm. The fire department will not be able to determine what the cause of the activation was.