I keep smelling exhaust fume-like smell everywhere i go. should i be worried?

Yes: If you are the only one who is smelling exhaust fumes, then this might be a sign of a chronic nasal / sinus infection. Rarely, this could be caused by and adverse effect of a medication, migraine headaches that occur without pain, or even more rarely, a stroke. See your doctor to evaluate these possibilities.

Maybe: See your doctor. Have him look in your nose. And consider a ct scan of your head, .