Ah yes, make robots susceptible to gas attacks, genius IOP industries

If I remember, this part would have taken place with their minds in the game the Division. So game world mechanics would have been forced upon them, even if their robot bodies would have had no issue with it.

Sure, but in the case of RO she has a mask with her mod3. She even uses it in her mod3 damage art.

can't imagine it would be that hard to make chemical weapons designed to harm androids, especially given how much time and reason there has been to do so in the GFL universe.