Shelter in Place
One of the instructions you may be given in an emergency where hazardous materials may have been released into the atmosphere is to shelter-in-place. This is a precaution aimed to keep you safe while remaining indoors. (This is not the same thing as going to a shelter in case of a storm.) Shelter-in-place means selecting a small, interior room, with no or few windows, and taking refuge there. It does not mean sealing off your entire home or office building.
Recommendations
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Close and lock all windows and exterior doors.
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If you are told there is the danger of explosion, close the window shades, blinds, or curtains.
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Turn off all fans, heating and air conditioning systems.
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Close the fireplace damper.
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Get your family disaster kit and make sure the radio is working.
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Go to an interior room without windows that are above ground level. In the case of a chemical threat, an above-ground location is preferable because some chemicals are heavier than air, and may seep into basements even if the windows are closed.
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Bring your pets with you, and be sure to bring additional food and water supplies for them.
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It is ideal to have a hard-wired telephone in the room you select. Call your emergency contact and have the phone available if you need to report a life-threatening condition. Cellular telephone equipment may be overwhelmed or damaged during an emergency.
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Keep listening to your radio or television until you are told all is safe or you are told to evacuate. Local officials may call for evacuation in specific areas at greatest risk in your community.