- Joined
- Sep 26, 2010
- Messages
- 9,837
Agree; point is that natural gas in a natural state has ZERO smell and thus methyl mercaptan or equivalent is added to alert a human to a leak. Carbon Monoxide may or may not have a smell depending on the conditions upon which it is created.CO is partial combustion - no smell and raw unburned NG or propane are different with required odorant and of course stink