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Because gas fumes are coming out and you're smelling them.
The fumes are the burnt exhaust gasses.
Exhause Fumes.
No, hot water heaters don't typically have a smell. If you are smelling fumes, you could have a leak in your gas line.
Exhaust
The "fumes" are more than likely antifreeze from a leaky heater core.
Fumes which are a byproduct of combustion within the engine block, most commonly Carbon Dioxide and Carbon Monoxide.
This can be caused by an exaust leak close to to your engine. Breathing exaust fumes can be harmful, get this checked out by a machanic.
Steam may be coming out the air conditioning unit if the engine is overheating. The best thing to do would be to shut the vents before any hazardous fumes begin to come out.
When you refuel your PWC it is important to check for gas fumes. You check for fumes before starting the engine and after adding fuel.
Skunks have special glands located under their tails that allow them to shoot a foul smelling liquid at others.
There is only 0.4 percent of oxygen in the car exhaust gases coming out of a car engine because most of it is used up in the combustion process. Exhaust fumes also contain carbon monoxide.