https://x.com/nbcwashington/status/2058168995040157977

Methyl methacrylate (MMA) is the momomer that polymerizes into plexiglass. The process of polymerization releases heat, which in turn accelerates polymerization. This is normally prevented in bulk storage by the addition of inhibitors. Corrosion and contamination can affect this.

Someone fucked up here. The runaway reaction has started and the only thing they can do now is to try to control the pace by removing heat.

The vapor being released is likely MMA, toxic, flammable, and heavier than air.

Not a good situation overall