What causes black soot and ghosting on the ceiling?



Answers:
dirty air filter in ac return vent

Other answers:
replace that dirty old air filter and make sure you dont have any bedbugs hiding behind your headboard! Dont smoke in your house, and do some cleaning and dusting!!
replace that dirty old air filter and make sure you dont have any bedbugs hiding behind your headboard! Dont smoke in your house, and do some cleaning and dusting!!
It could be candles.
Using a fireplace does this also if you have a plant that burns things close to your home pouring out smoke will do this soot thing.
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