Well, if it is important to you, there are options.
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I bought a Green Sleep mattress through tmasc.ca. The folks at tmasc absolutely delighted me with their service and quality of their products. As it relates to this discussion, Green Sleep publishes their eco institut report for safety
http://www.greensleep.com/Europe/Great-Brittain/EN/PDF/Hevea.pdf -
Another example, via foamorder.com. Their natural sense latex is Oekotex 100 certified, and they provide the report here
https://www.foamorder.com/certificate_natural_sense_foam.html
…These are just 2 examples, there are others. Lots of Oeko-Tex 100. For polyfoam and memory foam, there is CertiPUR.
There are definitely good options and companies that do what you’re looking for, but you need to look for the info.
Phoenix has a good post on helping determine some of the safety issues and certifications. I believe he usually references it as ‘how safe is safe enough’ for you:
https://forum.mattressunderground.com/t/mattress-question