RedactedNarrative: On the listed date and time, MPD Harbor Patrol units recieved a distress call over VFH 16 for people fainting onboard a vessel that was participating in the DC Parade of Lights.  Units responded and found several people suffering from CO poisoning.  These passengers were removed from the vessel and transported to EMS ground units for transport to local area hospitals for treatment.  Upon an investigation of the vessel, it was found that a generator was onboard the vessel and was operating inside an enclosed area.  The ventilation system was not able to properly handle the amount of exhaust being produced from the generator.  The exhaust from the generator was then circulated through the cabin of the vessel where the passengers were located.