In my part of Marin County, they use a bacteria, Bacillus thuringiensis, to control the mosquitoes. There are enough mosquitoes so that you'll get bit if sit in

In my part of Marin County, they use a bacteria, Bacillus thuringiensis, to control the mosquitoes. There are enough mosquitoes so that you'll get bit if sit in one spot long enough, but I don't recall ever getting bit while walking.