Newsom declares state of emergency in Orange County as failing chemical tank nears catastrophic explosion

Emergency crews launch overnight mission to neutralize a volatile chemical tank at a Southern California aerospace facility in Garden Grove as Gov. Gavin Newsom declares state of emergency.

Map: Potential Garden Grove tank explosion blast zone shows where homes, businesses could be damaged

The exact nature of the damage, and what contingencies are in place to deal with it, have not been made clear.

Chemical tank in Garden Grove, Calif., under threat of exploding, not actually cooling

40,000 people remain evacuated while crews put themselves ‘in harm’s way’ to try to avert disaster, official says.

Garden Grove chemical crisis: Live evacuation maps, closures and updates

Tens of thousands told to evacuate after a 34,000-gallon tank of methyl methacrylate leaked at an aerospace plastics facility, sending potentially toxic vapors into the air.

How worried should you be about a Garden Grove chemical spill or explosion’s impact on your health?

MMA is known to be an irritant, particularly for the lungs and heart, but it is not currently a known carcinogen in humans.