Hello,
Without examination it is very difficult
to confirm a diagnosis, but the symptoms are suggestive of
allergies to smoke or air borne allergies.Other possibilities may be recent sinusitis,nasopharyngeal problems, olfactory hallucination {(phantosmia)you detect smells that are not really present in your environment}and disorders in the smell perception centres.
In my opinion,a consultation of an ENT specialist or an allergist will be the best.