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There are circumstances when staying put and creating a barrier between yourself and potentially contaminated air outside, a process known as sheltering-in-place, can be a matter of survival.
Consider precutting plastic sheeting to seal windows, doors and air vents. Each piece should be several inches larger than the space you want to cover so that you can duct tape it flat against the wall. Label each piece with the location of where it fits. Use all available information to assess the situation.
What To Do
If you see large amounts of debris in the air, or if local authorities say the air is badly contaminated, you may want to shelter-in-place and seal the room. Quickly bring your family and pets inside, lock doors and close windows, air vents and fireplace dampers. Immediately turn off air conditioning, forced air heating systems, exhaust fans and clothes dryers.
Take your emergency supplies and go into the room you have designated. Seal all windows, doors and vents. Understand that sealing the room is a temporary measure to create a barrier between you and contaminated air. Watch TV, listen to the radio or check the Internet for instructions.