In my neighbourhood there is a lot of wood smoke that pollutes my home. Now with this app Wind Seeker I can see on my iPhone from which direction the wind blows. Then I can shut the windows on that side of the house and open them on the other side! This has a been great help! The app is awesome and very well designed. It is Pro. The price was very reasonable and no adverts! Can recommend this app also for other purposes than mine, like surfing et cetera.