Im pretty sure thats not fog water.Most of the smog is over the island and not the water. It might be a bit of both.
Manhattan is definitely not the most polluted but it is still polluted. Thats cities for you!
I lived in strasbourg, the citiy with the most bikes in france and with an amazing public transport system. It also only has 400000 inhabitants, and yet sometimes you see this type of pollution over it. Thats just the way cities work!
Especially when it hasn’t rained for a while or if there is no wind!
Doesnt take away any of the charm of NY tho!