[Labyrinthos]

Where I come from, carbon monoxide is odorless. Sulfer is generally associated with a rotten egg smell.

If I recall correctly, sulfur is often added to highly toxic, odorless gases such as carbon monoxide so that people can smell the leak before they are overcome by poisonous fumes.

[HipShot]

Carbon monoxide is a waste gas.

[null and void]

If I recall correctly, sulfur is often added to highly toxic, odorless gases such as carbon monoxide so that people can smell the leak before they are overcome by poisonous fumes.

Yes, a sulfur compound, brand name "Stinko" IIRC it's a mercaptan - the same class of chemicals that give skunks their aroma.

I Swiss friend of mine says they use a different chemical in europe, one that causes retching, as their domestic gas is a synfuel, containing abundant carbon monoxide in addition to the methane that makes up most of our natural gas.

Your trivia for the day...