The week of Thanksgiving, 1954, my grandmother was overcome by natural gas and died. The cause was an ancient water heater that did not have a safety valve. When the pilot flame went out, the gas did not shut off. She and my grandfather were vacationing in Florida, and it was a rental house. The flame went out in the middle of the night. They saved my grandfather, but my grandmother had had other medical issues, and they could not revive her. Whether the gas at that time had a smell added to it, or not, I do not know. It is all odorized today. In pulp and paper mills, we have many gases. Most naturally stink on their own. However, the safe employee must assume they don't all have a smell and that the odorous smell of a stinky one can mask the smell of a far more dangerous one.
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