I remember talking to a man who was in India during the second world war. He said when they landed there he got off the plane, took one breath and felt like he did’nt want to take a second breath because it smelled so rotten.
That reminds me of how South Korea smelled in 1961 when I arrived there as a soldier. The smell came mainly from human feces (used as fertilizer). It really took one's breath away, but over time one got used to it.
I cannot say that I missed it upon coming back to the USA, though.