[quote=@BCTheEntity]
[@Hillan] You keep bringing up that very low temperatures could essentially freeze smoke solid, whereas higher temperatures are less capable of dealing damage to smoke. Where is that coming from, and is there any source you can use to back up what you're saying? Because from what I'm reading, it is actually possible to set smoke alight in a backdraught/flashover effect due to it containing flammable particles that didn't burn already, though to be fair, that requires more oxygen than was already present in the atmosphere, and so may not be applicable in the case of what Xerxes was trying to do.
[/quote]

I'm not citing anything, I'm recallign what I'm remembering from Chemistry class, so I might be completely off. It's mostly based off of the fact that Fire needs oxygen to burn, and CO2 is pretty much the opposite of oxygen.