What would you have preferred they had done?Please stay on topic.
It is criminal to burn off that amount of Vinyl Chloride in open air..
Google Phosgene.
(Sorry, didn't answer the Phosgene part - open air burning isn't going to produce a lot of phosgene due to the water produced, but it is very toxic for the short time it will be around, which is why evacuating people is important.)
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