Lima, Peru is the largest city the country with over 9 million people in the surrounding metro areas. This has created a problem as there is little rain water for most of the residence, and no proper water treatment infrastructure.
But there is serious humidity, nearing 90% on a daily basis. That gave the University of Engineering and Technology of Peru an idea to promote their school and help the community.
Eventually, they built a billboard promoting the school that also converted the moisture heavy air into safe drinking water for the community to drink for free!