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The following Shelter-in-Place procedures are recommended as the best first response after the Safety Sirens are sounded:


  • Go inside your home or the nearest building
  • Bring in pets, if possible
  • Officials at the Fire Department, the Health Department and the Office of Emergency Services agree that in the case of chemical accident, those people who shelter indoors are much safer than those people who remain outside and are possibly exposed to chemicals


  • Close doors and windows
  • Use window and door locks to create a better seal
  • Make sure your vents and fireplace flue are closed
  • Turn off Heating, Ventilating and Air Conditioning


  • Turn on your radio and television for information and further instructions
  • The Community Warning System is designed to provide Contra Costa County-specific information directly to the media.  Public access television and radio stations such as KCBS 740 AM or KGO 810 AM will have ongoing status reports and information
  • Avoid using the telephone unless you have a life-threatening emergency