OP, you did not mention where in TV you live and if the smell is also outside. i mention this as I noticed a very distinct odor from the treatment plants on Buena Vista the other day, both at around 5 Pm and later at 10 PM. The other possibility would be a blocked vent pipe, try flushing each toilet, and see if you hear a gurling sound after the flush, do the same for a sink full of water on each sink.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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