It looks like Nokia today launched a new free game "Modern Mayor" for WP8 Lumia. The mayor gives the players the task of saving the city from the ruin and bringing it to its glory days. That means you have the responsibility of the whole building, keeping the city clean and shopping for charities. Even the city's journalist is there to help. You do not think the position is just a title, is it?
Nokia described the basics as having three facets to help develop the city: people, money and pollution. People are earned by building more houses. These homes can perform environmental actions that eliminate pollution produced. However, these people constantly pollute. You can unlock upgrades that will ultimately eliminate pollution. Without these upgrades will go a never-ending fight against pollution.