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• n  the time period during which military and civilian agencies are prepared for an enemy air attack
• n  the condition in which combat aircraft are airborne and ready for an operation
• n  the warning signal that begins a period of preparation for an enemy air attack

News & Articles

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• Spare the Air alert issued for Saturday
  A Spare the Air alert has been issued for the Bay Area for Saturday, as smog is expected to reach unhealthy levels because of the high temperatures and low winds.
  Sept. 7, 2013 - Napa Valley Register