No doubt it helps, but last time I spent a week rafting in very clear sunny weather and I was still having issues. It's probably a combination because being outdoors by itself was never enough to reel it in. Same thing happened in my teens when I worked construction for a summer, would come home dusty as hell and my skin was the clearest it had ever been all summer long, but all the time I spent hours outside playing various sports had little effect on my skin.

I think I just have really oily skin.