Wool by Hugh Howey
I highly recommend this book to all who love science fiction and dystopian novels. The author originally released five separate e-books online and when it gained so much popularity, it was bought and published as one novel.
The story is set in the distant future, where the air has become poisonous and what’s left of the human population lives inside a silo. The silo has many different levels of workers – the IT department, the mechanics, the farmers, and at the top, the mayor. The silo has windows at the top, but they become grimy every few years from the poisonous dirty air. As punishment, if any citizen says they want to be free from the silo, they are released into the toxic air wearing a body suit that will only keep them alive long enough to clean the dirty windows with a piece of wool. A heroine Juliette emerges to fight for justice after becoming aware of the tangled, political mess that rules the world of the silo.