The answer to this question is not a simple one. While the dry epoxy resin is not considered to be an environmental hazard, it would be a little bit of a stretch to call this an eco-friendly product. As we have already seen, many manufacturers will advertise their epoxy resin as being completely harmless. However, you have to read the fine print here. Epoxy resin is safe once it has dried and cured, but presents a few hazards before that.
The problem lies in the fact that epoxy requires the activation of certain chemicals, and these chemicals aren’t always the gentle kind. Thus, there is no way to completely avoid harsh fumes. That being said, some products are far more toxic than others, so I recommend that you check the MSDS (Material Safety Data Sheet) for your product just to be on the safe side.