The Poison Belt by Sir Arthur Conan Doyle [Professor Challenger #2]

In THE POISON BELT, professor Challenger returns in this sequel to THE LOST WORLD. Challenger has discovered that the world will pass through a cloud of poisonous gas in outer space, which will shortly wipe out all of humanity. In an effort to survive, he outfits a room in his house with oxygen tanks and makes it airtight. With a few of his closest friends, Challenger hopes to survive the poisoning of the Earth; what they might find afterward no one knows.