I've got a MB Pro 14", can't really use it outside at normal max brightness (500 nits); there's a program called Lunar which let's you blast the full display up to the normally-HDR-content-only brightness levels (so probably somewhere around 1000 nits); easily usable outside if not in direct sun; even in direct sun still somewhat usable. (Drains battery pretty fast though.)

Still not as nice as e.g. an e-ink display would be.

I don't think the M2 Air has this option, so I would say: not very usable outside.