Well, if it's something others can smell it's probably something in the air, but if not it can be caused by many things. Usually it's is due to temporal lobe seizures or even brain injury. These kind of smells are usually caused by Phantosmia which causes random smells to occur, which sometimes is triggered by some sort of disease i.e brain problems like a tumor ect, but this mostly isn't the case. I would advise you go to see your doctor and talk him through your symptom because it could be somthing serious, but i doubt it is. Smelling burning can also be caused by somthing like a 'Sinus Infection' or sometimes 'Anxiety', but please get it checked out.
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If you have consumed a lot of asparagus, this can make your urine smell like rubber. It is the way it is broken down by your digestive system.