Hi Polyphasicsleep,
You can read some of my thoughts about Essentia and some of the misleading claims they make and some forum discussions with them (as well as some of the FTC issues they have had about their claims) in this thread and this thread and posts #3 and #4 here).
The CertiPUR testing limits about the amount of VOC’s and harmful substances are lab tested and publicly disclosed although some of the criteria are by declaration as well. You can see my thoughts about CertiPUR in post #12 here and while they are industry sponsored … they are certainly a step in the right direction. There is also more about some of the different certifications in the industry in post #2 here.
Phoenix