Check out any standing water around, also piles of vegetation, damp stump, evern clumps of long grass. This is such a wet year.
There is something on the market for outside mosquito control, covers a certain amount of square footage.
Here, the gnats and mosquitos are o ubiquitous that I can't stay in my garden past dusk. Black flies, too. I think I am supporting the Cortaid people right now.