"Chemical releases and accidents involving gasoline, oil, paints and other hazardous materials could cause a wide range of serious injuries and possibly death from exposure to vapors, fumes and smoke. Sometimes, local officials may ask the public to protect themselves by staying inside their homes, cars and offices. At other times, local officials may order an evacuation. This special ESP Bulletin provides some basic preparedness tips and explains the difference between these two protective measures."
2002 State of California
Los Angeles County Chief Administrative Office: http://lacoa.org/
ESP Bulletin (2002), v.13 no.1