If we're talking about the USA, mosquitos are not dangerous enough to warrant taking any action whatsoever. Of the dozens and dozens of species of mosquito, there are less than a handful that are potentially dangerous, and only in a small region, and only sometimes.

There is no reason to spray chemical toxins in a yard because of mosquitos.

If you want to take action to reduce mosquito numbers, start with pooling water. They are often able to breed in ruts left by vehicles driving on paths where they aren't supposed to be.