The chemical agent will be sucked into the compressors and discharged back at the station with great loss of life
. Potassion iodie is effective in radiation incidents, but do not get the pills. Stockpile bottles of concentrated potassium iodide, and for $35 you will have both the ability to purify a large (thousands of gallons) quantity of water, but to protect ten thousand children. As for rifles, throw away the M-16's and the Rugers. You need M-14's in the civilian version with 20 round mags.