*immediately begins to worry about people being incentivized to make sure that your work has more errors in it, so they can get larger payouts*

like, what does that say? preventing any criticism of Israel, any at all, is more important than fighting the fascist threat in the US?

It's possible to find example of air being visibly hotter, but I think those typically happen with much larger differences in heat than we'd find in this movie. Our breath is visible on a cold winter night, but maybe not so much in the rainforest.

I could be completely wrong here, because my experience isn't with IR goggles, but with reflected IR light, but I'd expect heat vision would basically pick up the breath as small distortions rather than huge obvious puffs.

Air is not going to be emitting as much radiant IR energy as a solid or liquid, just by the nature of being so much less dense, so it shouldn't be too hard to filter out. But no system is perfect. You're going to see some behavior of the air if it's significantly different than the rest.

I'm going to out this firmly in the "maybe" category. There's a lot of factors here.

For instance, you generally don't want to be looking at heat signature of the air around you. Air is generally in the way of the things that you want to look at.