I've not experienced them before either. Kind of a translucent gnat, I don't believe these ones bite but they are plentiful. Based on comments on Nextdoor, this area didn't really have them until a couple of years ago. My brother in Michigan told me they have made an appearance in the northern part of the state in recent years. Swarms that make it hard not to inhale them.
We have them here in south western central Ohio. They are mostly a translucent green color. Mostly just annoying but they do bite usually between the ankles and knees. A friend of mine owns a Mosquito Joe franchise and they are working on updating their treatments to take care of them. They are here because of the mild winter we had last year. They are not a mosquito.