Personally I airbrush right at my building bench, which is in the basement not that far from furnace and water heater. I do have a well filtered spray booth for rattle can work but I feel I get so little overspray with the airbrush that I don't worry about it. If you are doing many 1:32 scale four-engined bombers it might be something else, but my workshops have almost always been in basement, and I have never had a problem airbrushing. I use mostly enamels, with an occasional Alclad lacquer.
Remember, an airbrush is not a spray gun, it is a brush that creates a brushless finish. If you crank pressure way up and spray from a foot or two away from the model surface you might have more risk, but then you'd get poor finish that way anyway.