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Tiny_Employee8253 t1_j1t8i5n wrote

Reply to comment by AGOODNAME000 in Everybody talks about having a CO2 detector but never what to do if the alarm goes off. by kymilovechelle

Cuz it's not for CO2. It's for CO. That's less dense than O2. Methane, CH4, also floats, but they add an extra gas in your natural gas so it smells like rotten eggs. It's probably mercaptan, H2S or ,SO2, which is more dense.

Also meaning, if you smell rotten eggs, you have a gas leak and the air in your house is potentially explosive. Get out and call the emergency crews. It's either natural gas or sewage gas.

Also, if it smells like fish, it could be propane or butane if you have tanks of those around. Some RVs use propane as a coolant instead of Freon.

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Cindexxx t1_j1vkeez wrote

Apparently a fishy smell can also be an electrical problem. I've never had it happen to me but it comes up on Reddit sometimes.

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Medic1248 t1_j1vu53j wrote

CO is almost identical to air so it entirely depends on the source. It will eventually evenly disperse but if it’s coming from a leak in the floor or a leak in the basement, it will build up along the floor and slowly dissipate into the air around

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