If you haven’t seen something like this before, the unit inside this billboard uses reverse osmosis to draw moisture out of the air so that it can be stored and then used as drinking water. What isn’t entirely clear is whether pollution gets stored in the humidity and molecules in the air and then is transferred to the drinking water. I suppose a simple filter once the water has been captured could help with that.

I’ve seen this system in action and they work great. I wonder if aid organisations like WaterAid use systems like this. It seems to me like a system that should be in every community that is struggling to find clean drinking water. Here is the story about this billboard:

http://www.laht.com/article.asp?ArticleId=700400&CategoryId=14095