What causes the steam to rise from vents in New York City's streets?

The correct answer addresses the phenomenon of steam rising from vents in New York City's streets, which primarily originates from the city's extensive underground steam system that supplies heat to many buildings. This system, operated by Con Edison, utilizes steam that can reach temperatures around 1,000 degrees Fahrenheit rather than 1,500 degrees, as stated in the incorrect answer choice.

When the steam escapes through vents, it creates a visible vapor effect that is characteristic of many urban environments, particularly in colder months. This steam results from the heating systems in buildings, which use the steam supplied through the underground network to warm interiors.

The large-scale deployment of this steam system is essential for providing heat and hot water to thousands of residential and commercial properties throughout Manhattan and parts of other boroughs, making it a vital component of the city's infrastructure. Although the heating systems in buildings utilize this steam, attributing the cause of the steam rising through vents directly to the heating pipes reaching 1,500 degrees misrepresents the actual operational details and temperatures involved in this process.