Shower Curtain
No natural fiber is truly waterproof. Pair a natural-fiber curtain with ventilation and an optional plant-based wax.
That sharp smell from a new plastic shower curtain is the curtain off-gassing. Testing of PVC and vinyl curtains found phthalate plasticizers making up as much as a third or more of the curtain by weight, alongside organotins and VOCs, and because these additives are not chemically bound to the plastic, they release steadily into the air, a process the warm, humid bathroom only accelerates. That is why the picks below skip vinyl for natural fibers.
Source: Camann et al. (2008), Epidemiology.
Below are the vetted bathroom swaps.
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No natural fiber is truly waterproof. Pair a natural-fiber curtain with ventilation and an optional plant-based wax.
Natural rubber contains latex proteins and is not for latex-allergic users.
A hygrometer measures how much moisture is in the air, so you can tell when your bathroom is too damp. Mold thrives in humid air, so keeping an eye on the reading and airing the room out when it climbs helps stop mold before it starts.
A dehumidifier pulls moisture out of the air. Most bathrooms do not need one, since an exhaust fan, a squeegee, and an open door handle the damp. This tier is for problem bathrooms with no window, a weak fan, or recurring mold, where keeping humidity low starves mold of the moisture it needs to grow.
The only bath filter with published testing.