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. If you are told to shelter-in-place, follow the instructions provided in this Fact Sheet.
Why You Might Need to Shelter-in-Place:
Chemical, biological, or radiological contaminants may be released accidentally or intentionally into the environment. Should this occur, information will be provided by local authorities on television and radio stations on how to protect you and your family. Because information will most likely be provided on television, radio, or notification, it is important to keep a TV or radio on, and your phone close by, even during the workday. The important thing is for you to follow instructions of local authorities and know what to do if they advise you to shelter-in-place.
The Centers for Disease Control and Prevention provide great insight on how to shelter-in-place at home, work, school, and in your vehicle.
CLICK THIS LINK to learn to Shelter in Place