Fire departments and doctors are reminding people to make sure they have a working carbon monoxide detector, especially on extremely cold nights.

When the temperatures get this cold, potential carbon monoxide poisoning can become a big risk with more people cranking up their furnaces, gas fireplaces, and using other alternative heating methods.

KMBC talked to Dr. Marc Larsen, an emergency physician with Saint Luke's Health System, about the red flags of CO poisoning.

Watch the full story below.

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