Those gases are heavier than air. The people are either in the cloud or walking around with the cloud at their ankles. Their cats and dogs are in the cloud. With any luck, the gases should have dissipated, but not a good idea to sleep on the rug. I have to wonder if the source chemical, vinyl chloride, would have been less dangerous.

Edit: I went and checked. Vinyl chloride might be worse. No good outcome.

Those gases are heavier than air. The people are either in the cloud or walking around with the cloud at their ankles. Their cats and dogs are in the cloud. With any luck, the gases should have dissipated, but not a good idea to sleep on the rug. I have to wonder if the source chemical, vinyl chloride, would have been less dangerous.