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What do you think the worst smell is when you are working on something? I think the oil inside the crankshaft main caps bolt holes when you are tearing down an engine is freakin' stinky!
I changed the gear oil in my 79's gear box a few months ago, I don't think it has been done since my dad had bought it near 20 years ago, very bad smell.
At work the worst smell is the yeast. I don't have to mix with it but it sure is foul smelling. Another one is vinegar, I used to work at a grocery store and if that spilled, it lingered through the store.
Burning clutch/brakes and gear oil.
At work we have this anti-bacteria stuff for the gas storage tanks, that we have to put in when they are empty. That stuff burns my nose a little.