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bondarchuk
Thought by whom? Surely the plastic engineers know what stuff they put into it. And although the article says most are unregulated, surely the regulators, governments, and voting populations tbh, are at least aware that they're not regulating this. If there ever was ignorance it was at least wilful ignorance.
HPsquared
Probably a lot of them are byproducts, side reactions etc. Things which form chemically alongside the main "plastic-making" reactions. Kind of like how car exhaust contains all sorts of compounds (most of which are burnt up by the catalytic converter, fortunately) other than CO2 and H2O.
robertlagrant
Not the voting populations, but yes, regulators should be aware of this stuff. They've failed pretty badly if not.
jajko
Do you realize its made of crude oil, which is not some trivial molecule like h2o that just has many same copies.

There are different-quality crude oil, ie IIRC russian one is on averafe lower quality.

Its not what they add (which varies based on what they currently work on), but what was there before. And once you burn it what it becomes.