Automobiles, heaters, cooking appliances, and other everyday items produce carbon monoxide when they run. This gas is normally vented out of buildings and cars long before it poses any health risk, but this cannot happen if exterior vents are blocked by snow, ice, or debris. Carbon monoxide is deadly in high quantities. Because the gas cannot be seen, smelled, or tasted, it is extremely important that all exterior home heating vents and vehicle tail pipes be cleared completely, and that smoke and carbon monoxide detectors are tested to ensure they have batteries and are working.

Symptoms of carbon monoxide poisoning may include:

Dull headache
Weakness
Dizziness
Nausea
Vomiting
Shortness of breath
Confusion
Blurred vision
Loss of consciousness

If you notice signs of carbon monoxide poisoning or your detector goes off, get into fresh air immediately and dial 911.

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— City of Somerville