From time to time folks ask us to identify the source of an odor. This task is nearly impossible through the internet, so should these questions be off topic?
- How to solve a known smell problem is on topic.
- Techniques a homeowners can use to track down the source of a smell could be on topic (but only needs a single question of which all others would be dups).
- Asking "what is this thing I'm smelling" I'd recommend as off topic for not having enough information to answer.
No. Let the community decide whether the smell can be discerned from the description--if not, treat it as you would any question with not enough information to answer.