Caustic main here, quick answer is : Nope, it doesn't, the only thing that affects is their visibility,even Bloodhound is affected in this one. It affects them the same way it affects enemies, except without doing damage. Same with his ultimate.

Does caustic gas affect team?

no slow, no damage just a little of visual obstruction (not blur, that's also gone). its always advised having a digital since the gas works in a similar way as the Bangalore one, if enemies are across the gas you'll hardly see them.

Are teammates immune to caustic gas?

[Question] Does caustic's gas hurt himself or his teammates or just enemies? Side note. An enemy caustic will not be affected by your gas.