…between the flinging of the two harpoons; and I think it may have been something more than that; the man who darted them happening, in the interval, to go in a trading ship on a voyage to Africa, went ashore there, joined a discovery party, and penetrated far into the interior, where he travelled for a period of nearly two years, often endangered by serpents, savages, tigers, poisonous miasmas, with all the other common perils incident to wandering in the heart of unknown regions.
There are no more uses of "miasma" in the book.
Show samples from other sources
Jem, sitting beside him, was squint-eyed, miasmal, and mute, as he always was in the morning.
Harper Lee -- Go Set a Watchman
The red miasma swam before her eyes; her stomach churned in ITs rhythm.