FDNY has a Citywide frequency of 154.43. CTCSS code is 186.2. Generally alarms of All Hands or greater are announced over this frequency and progress reports are also made to this frequency. You might also want to monitor the EMS Citywide frequencies of :
CW1 478.012500 FM CTCSS 85.4 0
CW2 483.987500 FM CTCSS 94.8 0