That's a great article for its breaking out the various chemicals and focusing on each one. In line with what I've been thinking, it's talking about dioxins as

That's a great article for its breaking out the various chemicals and focusing on each one. In line with what I've been thinking, it's talking about dioxins as a result of burning PVC (which was in some bulk hopper cars, according to a manifest I saw), which was burning as a result of the derailment (as contrasted with the liquid vinyl chloride, for which the burning was seemingly a deliberate economic decision). I agree that there should be more testing, and the fact that testing for expected combustion products wasn't start immediately to inform decisions about evacuation is criminal.