Diesel fumes, meanwhile, are highly toxic and pose a serious health risk. Read more: 5 Proven Tricks To Mouse-Proof Your Car And Garage. What Happens When You're Exposed To Diesel Fumes.

Diesel fumes are a mix of gases, vapors, aerosols, and particulate matter. Not all diesel fumes are the same, as their composition depends on the type of engine, fuel, oil, and other factors.