There are so many chemicals in the fabrics, plastics, coatings and adhesives in cars, I'd think it'd be hard to find a new one that isn't out-gassing a bunch of stuff, at least for the first few months. It's amazing that people go out and buy "tree" hanging air fresheners for their cars, when those things sometimes are full of formaldehyde and/or benzene.
A used car, on the other hand, may be easier on your system, since it's had time to outgas those chemicals somewhat.
Original equipment carpets can be removed and replaced, and seats can be rebuilt from the frame up. You'll still have potential issues with the dash, wiring insulation all through the interior and perhaps even the steering wheel.
The dealers are probably clueless about this stuff. You may get some response by corresponding directly with the manufacturer of the cars you are interested in. A couple of car companies got their start making fabrics (Toyota still makes commercial looms for example), so they may be able to recommend a natural standard fabric that they use in some models.
If you are concerned that a short test drive won't trigger a reaction, ask around about test driving a car over a weekend or try to find a comparable rental.
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