Chemical, biological, or radiological contaminants may
be released into the environment in such quantity and/or
proximity to a place of business that it is safer to remain
indoors rather than to evacuate employees. Such releases
may be either accidental or intentional. Examples of situations
that might result in a decision by an employer to institute
"shelter-in-place" include an explosion in an
ammonia refrigeration facility across the street, or a
derailed and leaking tank car of chlorine on the rail
line behind your place of business.
means selecting an interior room or rooms within your
facility, or ones with no or few windows, and taking refuge
there. In many cases, local authorities will issue advice
to shelter-in-place via TV or radio.
to stay or go
If you intend to include a shelter-in-place
option in your emergency plan, be sure to keep the following
on your circumstances and the type of emergency,
the first important decision is whether you stay
put or get away. You should understand and plan
for both possibilities. Use common sense and available
information, including what you are learning here,
to determine if there is immediate danger. In
any emergency, local authorities may or may not
immediately be able to provide information on
what is happening and what you should do. Use
available information to assess the situation.
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."
However, you should watch TV, listen to the radio,
or check the Internet often for information or
official instructions as it becomes available.
If you’re specifically told to evacuate
or seek medical treatment, do so immediately.
Use telephones, televisions,
and radios for receiving instructions or emergency information.
The Internet may be a valuable source
of information during an emergency.
Alarm methods may vary
on the type of emergency.
- Implement a means of alerting
your employees to shelter-in-place that
is easily distinguishable from that used to
signal an evacuation.
- Train employees in the shelter-in-place
procedures and their roles in implementing
Train employees for
procedures just the same as you would
for evacuation procedures.
Specific procedures for shelter-in-place
at a worksite may include the following:
- If there are customers, clients, or visitors in
the building, provide for their safety by asking them
to stay – not leave. When authorities provide
directions to shelter-in-place, they want everyone
to take those steps immediately. Do not drive or walk
- Unless there is an imminent threat, ask employees,
customers, clients, and visitors to call their
emergency contact to let them know where they
are and that they are safe.
- Turn on call-forwarding or alternative telephone
answering systems or services. If the business
has voice mail or an automated attendant, change
the recording to indicate that the business
is closed, and that staff and visitors are remaining
in the building until authorities advise it
is safe to leave.
Have employees and anyone
else in the building call their emergency contacts, then
turn on answering
- Quickly lock exterior doors and close windows,
air vents, and fireplace dampers. Have employees
familiar with your building’s mechanical
systems turn off all fans, heating and air conditioning
systems, and clothes dryers. Some systems automatically
provide for exchange of inside air with outside
air. These systems, in particular, need to be
turned off, sealed, or disabled.
- If you are told there is danger of explosion,
close the window shades, blinds, or curtains.
Close or tape-off
all vents in the room.
Gather essential supplies
such as a first-aid kit.
- Gather essential disaster supplies, such as
nonperishable food, bottled water, battery-powered
radios, first-aid supplies, flashlights, batteries,
duct tape, plastic sheeting, and plastic garbage
- Select interior room(s) above the ground floor,
with the fewest windows or vents. The room(s)
should have adequate space for everyone to be
able to sit. Avoid overcrowding by selecting
several rooms if necessary. Large storage closets,
utility rooms, pantries, copy and conference
rooms without exterior windows will work well.
Avoid selecting a room with mechanical equipment
like ventilation blowers or pipes, because this
equipment may not be able to be sealed from
- It is ideal to have a hard-wired telephone in the
room(s) you select. Call emergency contacts 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.
- Take your emergency supplies and go into the
room you have designated. Seal all windows,
doors, and vents with plastic sheeting and duct
tape or anything else you have on hand.
- Consider precutting plastic sheeting (heavier
than food wrap) to seal windows, doors, and
air vents. Each piece should be several inches
larger than the space you want to cover so that
it lies flat against the wall. Label each piece
with the location of where it fits. [See Fig.
- Write down the names of everyone in the room,
and call your business’ designated emergency
contact to report who is in the room with you,
and their affiliation with your business (employee,
visitor, client, customer).
- Listen to the radio, watch television, or
use the Internet for further instructions until
you are told all is safe or to evacuate. Local
officials may call for evacuation in specific
areas at greatest risk in your community.
Fig. 1. Tape plastic sheeting
vents, windows, and doors to
prevent contaminated air
from entering the room.