>>15465873
>So I need to avoid buying things like oats or rice sold in cardboard boxes?
I would, but if it is also packaged on a plastic bag that is probably PE which is not a functional barrier against the contaminants that I mention (unless for some odd reason it contains EVOH) so all cereals and things like that can be polluted with all the garbage that comes from cardboard recycling.
is there anyway to check whether they're using clean types?
It depends on the country, in Switzerland recycled paper, cardboard is banned with direct food contact and in the EU it will be banned soon unless you put a functional barrier to it. In the US no one has to declare it, so no provider will tell you.
Waxed paper was a functional barrier which is why it is allowed to wrap candy and other confectionary goods

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Recent research raises health concerns around toxic metals in popular beverages