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MarieSkiis t1_je2h9qj wrote

My guess would be the exhaust fans from the Holland Tunnel are kicking in at that hour? If you walk around the neighborhood you’ll easily spot at least 3 unmarked structures that pump out exhaust fumes from the tunnel. But what do I know?

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bodhipooh t1_je37lpd wrote

Those fans run continuously, not just at 1 AM. All of the air in the Holland Tunnel tubes is replaced every 90 seconds.

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