Strong acetone smell from brand new MacBook Air

Acetone is a powerful solvent that destroys plastic and damages electronic components. I’m almost positive you are not smelling acetone but perhaps vapor from curing adhesive. Sure, take it back to the Apple Store you purchased it from for examination.

Did you buy it from Apple? It didn't happen when I bought mine. Acetone (if that's what it is) is extremely volatile and you'd have to spill a heck of a lot for it still to be evaporating three weeks later. Have you removed all the protective plastic from the Mac. I'm not saying that's causing it - just asking.

Unfortunately you've missed the 14-day free return period (assuming you bought from Apple), but if it still smells then book a genius bar appointment and have it looked at.

Did you return it and get a new one? I bought an AirM5 and the smell when it came out of the box was overwhelming. It was so bad I exchanged it for a new one before the 14 day window was up. Well, I have had this one 4 months and I am still dealing with the strong weird chemical smell. If I close it, when I open it the smell hits me in the face. My eyes get irritated and I will get a headache if I use it too long. I bought it to the Apple Store, they looked inside and said "it's fine". I explained it was not fine and I am not able to use it but they were dismissive and not interested. I have seen other folks claiming the same type of issue.