Exactly, but the lack of a water cycle on the moon means that all the dust is sharp and always will be.

It will irritate human mucus membranes whenever it comes in contact. Irritate lungs, eyes, skin.

It degrades rubber seals.

I walked up to the flows on Fagradalsfjall when it was erupting a couple of years ago, and I found the cinereous, sulfurous air to be very medicinal and clearing. I'm not sure it'd have good for me for more than a few hours, but as it was, it was great. I occasionally wish I were able to just have a chamber with that air in it.