(Rough): “I do not think it’s the Electrobomb’s influence, not only that, (I’m sure that) everyone (else) also thinks it..”

Kiibo mentions nothing to do with a malfunction. That is not even a point of contention. Nothing about ‘not knowing’ either, it’s about what he thinks, and what he thinks is that this situation has nothing to do with the Electrobomb, and suggests that everyone else agrees with that notion.

This is what prompts Tsumugi to say that she’s not affected, and for Himiko to tell him that it’s ‘got to be the Electrobomb’. At a glance, the latter seems reasonable, except [on further review], it doesn’t make sense. We also have to remember that Himiko is only saying this because Kiibo is a robot, and that’s how she reasons the air affecting Kiibo.

But there’s more to Kiibo’s emphasis that the air would affect them. Because…

…in Kiibo’s current state, he does not handle polluted air well. This would explain why he faints on later opening the door.

He also has the means to determine the air’s content, to a degree. Thus, if he could only vaguely determine what was up with the air - even its scent - it means something in the air was confusing his system, and making this impossible for him. Which is why he prompted the others to determine something.

Isn’t it strange how he could not detect any traces of blood…?