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Sandy Fire Threatens Former Nuclear Lab, Triggering Air Monitoring Around Contaminated Site

Firefighters are monitoring air quality near the contaminated field laboratory as more than 1,100 crews work to keep the blaze from spreading.

  • The Sandy Fire, which ignited Monday in Simi Valley, has burned 2,115 acres and reached 30% containment by Thursday morning, according to the Ventura County Fire Department.
  • Firefighters are specifically monitoring the Santa Susana Field Laboratory, a former nuclear and rocket testing site where a partial meltdown occurred in 1959, to prevent contaminated areas from burning.
  • More than 1,100 firefighters battle the blaze as officials downgraded many evacuation orders to warnings following Tuesday's peak, when over 44,000 residents were under mandatory orders in Ventura County.
  • The Simi Valley Unified School District announced all campuses will remain closed through the week and the upcoming Memorial Day holiday, while air quality monitoring continues around the fire perimeter.
  • Meteorologists expect temperatures between 80 and 84 degrees with light winds, aiding containment efforts, though officials urge residents to limit outdoor activity due to potential smoke impacts.
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Patch broke the news in United States on Thursday, May 21, 2026.
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