California Governor Gavin Newsom declared a state of emergency for Orange County on Saturday, following a chemical leak earlier in the week that triggered the evacuation of nearly 50,000 residents.

The emergency was triggered after an initial leak from a storage tank containing methyl methacrylate (MMA), a highly flammable industrial chemical widely used in aerospace manufacturing, at the GKN Aerospace plant.

In a statement, Newsom said the safety of Orange County residents remained the state’s highest priority, adding that California had mobilized all available resources to support emergency responders and affected communities.

The emergency declaration enables authorities to accelerate coordination between local, state and federal agencies responding to the crisis, while unlocking additional emergency resources.

Officials warned that the unstable tank has remained at dangerous temperatures for several days. Authorities said excessive heat could cause pressure inside the container to rise to catastrophic levels, potentially compromising the tank’s structural integrity.

Emergency management teams cautioned that a major rupture or explosion could release thousands of gallons of hazardous chemicals, threatening nearby industrial facilities and triggering secondary fires, toxic exposure and widespread environmental contamination.

Local authorities repeatedly stressed that preventing an explosion remains the central objective of the operation.

Janet Nguyen told the Los Angeles Times that experts from across the United States were being consulted in search of alternative solutions, including possible methods to freeze or solidify the chemical to stabilize the tank.

Fire crews have used remote-controlled water cannons, sprinkler systems and continuous cooling operations in an attempt to reduce temperatures without exposing firefighters directly to danger.

According to officials, the incident began when the overheated tank released chemical vapors through its pressure-relief system. Although the situation initially appeared stable, conditions later deteriorated, prompting expanded evacuation orders affecting parts of Southern California.

Containment efforts have also focused on environmental protection. Emergency teams installed sandbags and earthen barriers to prevent chemical runoff from reaching storm drains, rivers and coastal waters should the tank fail.

Hazardous materials specialists from across the country have reportedly joined local agencies in efforts to safely transfer or neutralize the chemical load.

Government air-monitoring teams continued testing around evacuation zones. While officials said no widespread dangerous air pollution levels had been detected outside restricted areas, they warned that changing conditions inside the tank made the risks unpredictable.

Health officials warned that exposure to concentrated MMA vapors may irritate the eyes and respiratory system and could cause dizziness, nausea and breathing difficulties.

Despite evacuation orders, some residents reportedly refused to leave their homes. Authorities warned the situation could deteriorate rapidly, while emergency shelters remained open for displaced residents.

As of Saturday afternoon, no injuries had been reported, according to company and government statements.

GKN Aerospace stated that community and worker safety remained its top priority as engineers and emergency crews continued efforts to prevent what officials fear could become one of Southern California’s most serious industrial chemical disasters in recent years.

Authorities said approximately 50,000 residents across parts of six Southern California cities remained under evacuation orders due to the emergency.(ILKHA)