According to a representative from North Tahoe Fire, the CO level at a vacation home housing 13 people was as high as 55 parts per million, and the home did not have CO alarms. The Centers for Disease Control and Prevention reports that the long-term exposure indoors should be limited to less than 15 ppm.

Carbon monoxide is especially dangerous because it's an odorless, colorless and tasteless gas. Symptoms of carbon monoxide poisoning may include a dull headache, weakness, dizziness, and nausea, according to the Mayo Clinic.

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