Well ventilating 130 people correctly at once requires 260 people. First thing is move them to a better environment, then o2 and narcan. If their stupor is reversed and they weren't dead, they would breath on their own even if somewhat brain damaged. Either the way this type of Mass Casualty Incident is beyond preparing for unless you are the Military, and even then it takes alot of time for the triage and treatment.
I saw a slideshow of the aftermath and they had loaded unconscious people onto buses and toted them to the hospital slumped over and all.. I guess if you were breathing you went, if you didn't you got a toetag.