Firefighters reportedly found potentially deadly carbon monoxide readings of 560 parts per million inside the building when they arrived.
Eyewitness News is told a 40-year-old woman was rushed to Interfaith Hospital in critical condition.
The other victim, a 16-year-old boy, was taken to the hospital with less serious injuries.
A neighboring building was briefly evacuated when firefighters took less serious readings of 80 parts per million.
That building was aired out and the 15 residents were let back inside.
A boiler pipe that dislodged from the chimney is suspected of causing the carbon monoxide leak.
NEW YORK AND TRI-STATE AREA NEWS
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