I took this photo at the Biltmore Fashion Park shopping center over the weekend. Our humidity has been a tiny bit higher than usual over the last few days so when those cooling misters are running, it makes it look like a heavy fog. If you look closely, you can see that the "fog" is actually coming from the building edges. That's where the mister lines are located. Normally, the air is dry enough that the mist doesn't really show that much. It just does its job cooling the air.