That’s how it was here - DH and DS have seasonal and pet allergies (I don’t), but I did that summer. It didn’t bother either of them. DH did a lot of the cleaning, and switched out the a/c filters. I just reminded him about that and he said, “Yeah, that was a pain”.
We noticed dusting, it not our normal dust, it was brownish colored.
Sahara dust has silica in it - fine pieces of sand.
It’s the most aggravating thing I remember breathing.