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FDNY, Fire Department, City of New York
-composed of individual Engine, Truck, Ladder, Rescue, HazMat, and EMS companies, as well as other specialized units which handle most of the city's emergencies that could cause dammage to life and property. The FDNY was technically the agency in command of the response at the WTC site.

NYPD - New York City Police Department. 
-Provides law enforcement for the NYC. Police Emergency Service Units are also mentioned. These are groups which share some of the responsibilities and training of firefighters, and are familuar with technical rescue equiptment.

PAPDNYNJ - Port Authority Police Department of New York and New Jersey. 
-Responsible for providing protection at all of the major ports and entrances to NYC, incluing bus terminals, shipping docks and ports, train stations, rail yards, bridges, tunnels, and other commuter and shipping hubs.

This article does not specifically address emergency response. It focuses more on the public health, its responsibility to deal with the health of immigrants, and the social factors behind this. 

This article was published throught the National Institute of Public Health's Public Access database. The NIH makes all of the peer reviewed articles and studies that it funds available to the public on this platform "to advance science and improve public health."