In some cases, officials may determine to advise people to stay indoors and take steps to reduce the flow of air into the structure as the most effective protective option.  Emergency officials may use this strategy when it is recognized that people cannot be evacuated from an area prior to the arrival of a toxic cloud.  If indoor sheltering is recommended all available means will be used to advise the public of proper actions to take. These include:

a.       Stay inside.
 
b.       Close all doors and windows.
 
c.       Turn off all heating and air conditioning units.
 
d.       Turn off all outside exhaust fans or units.
 
e.       Cover mouth and nose with damp cloth.
 
f.         Listen to radio or television for additional instructions and updated evacuation notices.