Are you still using a back-up generator or auxiliary heat sources after the flooding?
Don’t use anything indoors that burns fuel, such as gasoline-powered generators, camp stoves and lanterns, or charcoal grills – they all give off carbon monoxide - a colorless, odorless gas.
It can kill you.
Opening doors and windows or using fans won’t prevent a buildup of carbon monoxide. Have your water heater and gas furnace exhausts checked to make sure they aren’t blocked.
If you feel sick, dizzy or weak while using a generator, get to fresh air right away!
From the NH Department of Environmental Services.