Authorities in Orange County, California, issued evacuation orders for approximately 40,000 residents after a chemical tank at a Garden Grove aerospace plant showed signs of critical failure.

The tank, containing up to 7,000 gallons of methyl methacrylate—a flammable compound used in plastics production—was overheating and venting vapours, raising concerns about a possible spill or explosion.Officials described the situation as a serious health risk, with exposure capable of causing severe respiratory distress.Fire crews have intervened to neutralise one hazardous tank, but another remains unstable due to a faulty valve and rising temperature.

Measures such as water spraying and sand barriers around the tanks have been implemented to reduce temperature and prevent contamination of storm drains and waterways.

Police have been conducting door-to-door checks to ensure compliance with evacuation orders, although about 15 percent of residents initially refused to leave.No injuries or fatalities have been reported so far.Experts note that a controlled spill is preferable to an explosion, which could scatter chemical residues and shrapnel, intensifying the hazard.Monitoring continues, with emergency crews ready to respond while prioritising safety.