All over the apartment complex this morning, there were smoke detectors ringing. Not because there were any real fires going on. It's because of the weather. As the weather cools down, people naturally turn the heaters on. In these apartments, the AC/heater units must have some kind of heating element that collects dust, because as soon as you turn them on (after being idle for most of the summer), there's invariably the smell of something burning. The accompanying smoke of course triggers the smoke detectors. There were plenty of smoke detectors going off this morning as I walked back and forth on trips to the laundry room.
Happens every year.