Looking for children's sci-fi book, 1980s?
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This is a long shot, but I read a book when I was a youngish teenager (late 80s or very early 90s but was a library book so could have been older) about a time when the surface of Earth was uninhabitable. The story was from the viewpoint of a child/children who lived in underground tunnels/ducts/pipes, there may also have been biodomes on the surface. The children eventually discovered that Earth was habitable after all, a beautiful place, either no one knew or this was a secret known only to an elite group of humans.
That's all I can remember, but I loved it at the time I read it!
Any ideas welcome, thank you.