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Why does steam percolate from below New York city streets? (both)

Every time I see a scene of New York streets, there is always steam coming for the manholes.
Where does this steam come from?
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Sewer steam is more common in cold climates. This is simply because the sewers are warm. After all, they are transporting water that was just in warm homes and buildings. That heat rises up out of the sewer and turns into steam when it meets the cooler temperatures of the air.
plumbingsolved.com › why-does-steam-come-out-of-sewers
Monaschandroff86 · 18-21, F
@cinsac how come steam doesn’t come out the sewers anywhere else in the world
Gusman · 61-69, M
@Monaschandroff86 Good question that one 👍
SW-User
@cinsac Ewww🤢
@Monaschandroff86 good question that.
@Monaschandroff86 That would be hard saying, not knowing.