Gas smell in kitchen

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While propane or butane are not gases that the human body uses, they are not dangerous or poisonous, unless in unusually high concentrations. A small leak that you can smell is not dangerous, only a waste of gas and annoying. Very dangerous, highly toxic and even deadly in certain lower concentrations, is carbon monoxide, a colorless and odorless gas that is taken up by the blood much more rapidly than oxygen, which it quickly displaces . When you see a flame in your oven, stove burner or hot water boiler that displays a lot of yellow color, that means the fuel is NOT burning cleanly, which produces high quantities of carbon monoxide. In a closed area, this can be very deadly, and is probably what raquelita was referring to, not small propane or butane leaks. On the other hand, leaking propane or butane gaz in sufficiently high quantities, caused by a BROKEN HOSE or broken GAZ CONNECTION, if ignited in any way, can cause a massive EXPLOSION, which also would probably be deadly.