Definition of "insalubrity"

[S]uch an one […] recalls as a vision of Paradise the land he has learnt to love; he exaggerates the insalubrity of a northern climate; he bewails the wretched formality of our civilised life, and so, back to the distant solitudes flies his recollection like a dove to the wilderness.

1874, Georg August Schweinfurth, chapter I, in Ellen E. Frewer, transl., The Heart of Africa: Three Years' Travels and Adventures in the Unexplored Regions of Central Africa, from 1868 to 1871‎, second edition, volume I, London: Sampson Low, Marston, Low, And Searle, translation of Im Herzen von Afrika, Botanical Ardour