Why wear mask below nose when I am far away from everyone? Why not just take it off? I want to have easy access to move it up when needed. I am typically just

Why wear mask below nose when I am far away from everyone? Why not just take it off? I want to have easy access to move it up when needed. I am typically just walking and the weather is cool these days, so I do not experience sweating. Also since the hot air is not exhaled directly into the mask, it prevents/slows down the heating of the mask. Why not wear it fully? I find it easier sometimes to breathe without a mask. So, when it is safe to do so, I lower it.