If you're wondering how in the hell woodworking exposes you to formaldehyde, the answer is that it's in some glues. In particular: urea-formaldehyde glued are

If you're wondering how in the hell woodworking exposes you to formaldehyde, the answer is that it's in some glues. In particular: urea-formaldehyde glued are used in the manufacture of sheet goods: plywood, OSB, MDF, etc. UF glue is also used in some veneer and lamination work because it gives a hard glue line (unlike yellow wood glues). That reduces springback on bent lamination work. I believe it also has a longer open time than most other adhesives used in woodworking. A long open time is really nice if you're doing bent lamination. My go-to is liquid hide glue for bent lam and veneer work. It also has a pretty hard glue line and a better open time than hot hide glue, though likely worse than something specifically formulated for a long open time. It's a tradeoff.