The green fly situation is greatly exaggerated. When I was a kid, & much of the island was undeveloped, they could be bothersome. Now, they are pretty much confined to the far north end of the island, the back bay areas, & some of the golf course; this is their habitat. In very hot, still weather they can be a problem in those areas. when there is a breeze much less so. Where I live, for example, in the center of the island, I literally never see a green fly. There are also green flies in other towns, inland in Galloway township, wherever it is marshy.