10/14/2026
As temperatures fall and heating systems, fireplaces, generators, and fuel-burning appliances are used more frequently, we would like to remind all residents about the dangers of CO (carbon monoxide).
CO is often called the “silent” or “invisible killer” because it is a colorless, odorless, and tasteless gas that cannot be detected by human senses. Exposure to carbon monoxide can cause serious illness, permanent injury, or death within minutes, making awareness and prevention critical for every household.
CO is produced whenever fuels such as gasoline, natural gas, propane, oil, wood, charcoal, or coal burn incompletely. Common sources include furnaces, water heaters, fireplaces, wood/pellet stoves, portable generators, gas-powered equipment, and motor vehicles. When these appliances are not properly maintained or ventilated, dangerous levels of CO can accumulate indoors.
CO prevents the blood from carrying oxygen effectively throughout the body. Early symptoms can resemble the flu and are often overlooked. Common signs include headache, dizziness, weakness or fatigue, nausea or
vomiting, shortness of breath, chest pain, and confusion or disorientation. Severe exposure can cause loss of consciousness, permanent brain damage, and death. People who are sleeping may never recognize the symptoms before becoming overcome by the gas.
Everyone is vulnerable to carbon monoxide poisoning, but certain groups face greater risk. This including infants and young children, older adults, individuals with heart disease, people with respiratory conditions and individuals with anemia. These populations may experience symptoms sooner and suffer more severe health effects.
Fortunately, carbon monoxide poisoning is largely preventable through proper maintenance, detection, and safe operating practices. Install CO alarms on every level of the home, and according to manufacturer
recommendations. Test alarms regularly and replace batteries as needed. Replace the entire alarm unit according to the manufacturer's guidelines but at least every 10 years. Have furnaces, boilers, water heaters, fireplaces, and other fuel-burning appliances inspected and serviced annually by qualified professionals. Proper maintenance helps ensure equipment operates safely and vents correctly.
Portable generators are a leading cause of carbon monoxide poisoning during power outages. Never operate a generator inside a home, garage, basement, crawl space, or enclosed area. Place generators outdoors in well-ventilated locations away from doors, windows, and vents. Follow all manufacturer safety instructions.
Charcoal grills, camp stoves, and other outdoor cooking devices should never be used inside homes, garages, tents, or enclosed spaces because they can quickly generate deadly levels of CO. Never run a vehicle inside a garage, even with the garage door open. Ensure vehicle exhaust pipes remain clear of snow, ice, or debris during winter conditions. After snowstorms or severe weather, inspect exterior vents for furnaces, dryers, fireplaces, and other appliances. Blocked vents can cause CO to back up into the home.
If your CO alarm activates move everyone immediately to fresh air outdoors or near an open door or window and call 911. Do not re-enter the building until emergency responders determine it is safe. Immediately seek medical attention if anyone experiences symptoms of CO poisoning.
CO poisoning is a serious but preventable hazard. By installing and maintaining carbon monoxide alarms,
ensuring fuel-burning appliances are serviced regularly, and following safe practices with generators, vehicles, and heating equipment, families can significantly reduce their risk.
Numerous times each year, we have responded to incidents where a properly functioning carbon monoxide alarm provided early warning and helped prevent a tragedy. Taking just a few minutes to test your alarms and ensure they are working properly can make a life-saving difference.
When in doubt - - - get out - - - stay out! NEVER assume any alarm is false. Whether it's a fire, carbon monoxide, or another safety alarm, take it seriously every time. The Greenleaf Fire Department will respond and investigate, and there is NEVER A CHARGE for this service.