Its better to smell something inside your nose rather than smelling all the filth in other people's rotten minds !!!
Jokes apart, you seem to be suffering from an acute attack of sinusitis
, this foul odour being a prodromal symptom. Cold, nasal discharge will follow.
Start a nasal decongestant drops.
Take an antiallergic and a mucolytic
A mild antibiotic like Azithromycin
will definitely be of help.
Drink plenty of water.
Avoid dusty and smoke-filled places.
Go for a total and differential count of blood.
If the problem persists, do not hesitate to consult an ENT Specialist
Wishing that you smell daffodils and roses soon.