Silo on Apple TV

Perhaps the poison in the exit airlock comes from the same pipe?
Yeah I can see that. I posit that the people in charge have to have the ability to poison people outside--as we are getting hints to from Jimmy/Solo...it was the 'dust' clouds that came in. What real purpose would poisoning everyone inside serve--if they could just head outside and meet the same demise?? The air is safe! I wanna go OUTSIDE!