Smog Forest Escape

Your city is very big and its territory is full of huge factories. In summer, when very hot, in the city there is a strong and could not breathe. You have decided that it is better to wait out the heat in the forest, which is located outside the city. You went there and saw that the forest heavy fog. It turns out, and was able to get here. You have already gone far and because of poor visibility lost. You need to find a way home.