California tank holding dangerous chemicals is set to explode or leak, officials say. Here's what to know

TL;DR

Tens of thousands evacuated due to a leaking chemical tank at GKN Aerospace in Garden Grove, California.
The tank holds 7,000 gallons of methyl methacrylate, a highly flammable and volatile substance.
Officials warn the tank could fail, leading to an explosion or a large spill.
Governor Gavin Newsom declared a state of emergency for Orange County, mobilizing state resources.
Efforts are underway to keep the tank cooled, as internal temperatures are increasing.
Homes within a one-mile radius have been evacuated; there is no timeline for their return.
Methyl methacrylate is a respiratory irritant and can cause lung, skin, and eye irritation, nausea, and dizziness.
Authorities have used sandbags to create containment barriers to prevent chemicals from entering storm drains or waterways.
The cause of the leak is currently under investigation.

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