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Carbon monoxide is a dangerous gas that you cannot smell or see. It is produced as a common byproduct of the combustion (burning) of fossil fuels. Most fuel-burning equipment (natural gas, gasoline, propane, fuel oil and wood), if properly installed and maintained, produces little carbon monoxide. The byproducts of combustion are usually safely vented to the outside.
If there is a shortage of oxygen to the burner of an appliance or piece of equipment, however, or venting is inadequate, carbon monoxide can increase to dangerous levels. Common sources of carbon monoxide include gasoline engines running in closed garages, fuel-burning space heaters or water heaters with improper venting and blocked chimneys or vent pipes.
If you breathe in carbon monoxide, it enters your bloodstream and robs oxygen from blood cells. This is called carbon monoxide poisoning.
Prevent carbon monoxide poisoning
Carbon monoxide poisoning safety tips
- Install a UL-approved carbon monoxide detector and alarm. These devices measure the amount of carbon monoxide in the air and sound an alarm at certain levels. They should be considered as a backup and not as a replacement for proper use and maintenance of your fuel-burning appliances. Preventing carbon monoxide from becoming a problem in your home is better than relying on an alarm.
- Have a qualified professional routinely maintain and inspect all heating systems and any fuel-burning appliances annually to ensure they are in good working condition.
- Have a qualified professional routinely inspect appliance vents and chimney flues annually for blockages, corrosion, cracks or leakage.
- Never run a vehicle or use unvented fuel-burning equipment in an enclosed space.
Symptoms of carbon monoxide poisoning
Since many of the symptoms of carbon monoxide poisoning are similar to those of the flu, food poisoning or other illnesses, you may not think carbon monoxide poisoning could be the cause.
Low levels of carbon monoxide exposure can cause shortness of breath, mild nausea, fatigue and mild headaches.
Moderate levels can cause headaches, drowsiness, nausea, vomiting, confusion, dizziness or light-headedness.
Severe cases of carbon monoxide poisoning can result in unconsciousness and death.
What to do if you suspect the presence of carbon monoxide
If it is safe to do so, immediately turn off and stop using the gas appliance you suspect is causing the problem. Open the windows to ventilate the area. Do not use the appliance again until it has been determined to be safe by a qualified professional.
Get out of the building and make sure that no one goes back into the building until you are assured that it is safe.
- Call 9-1-1 and seek medical attention if anyone experiences possible carbon monoxide poisoning symptoms.
- Contact PG&E or a qualified professional to have the appliance inspected.
At PG&E, nothing is more important than safety.
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