The state Department of Public Health issued a warning Monday about the dangers of carbon monoxide and tips for residents to prevent carbon monoxide poisoning.

"In anticipation of power outages, DPH is very concerned about improper use of portable generators and other sources of heat, which could lead to CO poisoning," DPH said in a news release.

DPH warned that breathing in excessive amounts of Carbon Monoxide, an invisible, odorless gas, can cause loss of consciousness and death. Symptoms can mimic those of the flu, including headache, fatigue, dizziness, weakness, nausea, vomiting, chest pain, confusion or loss of consciousness. People who are sleeping or unconscious can die from carbon monoxide poisoning before exhibiting symptoms.

Anyone exhibiting these symptoms should leave the house immediately and call 911 and the Connecticut Poison Control Center at (800) 222-1222.

DPH provided the following guidelines:

• Never use portable generators or other gasoline-powered equipment, including tools, indoors or in the garage, basement, shed or other enclosed spaces. Even if the garage or shed doors are open, CO gas can still build up to dangerous levels within minutes.

• Place portable generators at least 20-25 feet from your home. There have been instances where exhaust containing CO gas has been blown back into the house and poisoned occupants when outdoor portable generators were close to the house.

• Opening windows and doors, and operating fans is not sufficient to prevent buildup of CO in a home.

• Use charcoal and gas grills or camping stoves outdoors only.

• Make sure exhaust vents for your furnace and gas appliances are free of snow. Exhaust vents blocked by snow can cause combustion gases to back up into the home.

• After a snow storm, make sure your car's exhaust pipe is clear. A clogged exhaust pipe could lead to carbon monoxide buildup in your vehicle. Fatalities have resulted from people trying to warm themselves in their car without clearing snow away from exhaust pipe, building up CO gas in the car.