Fourteen people were hospitalized due to exposure to dangerous levels of carbon monoxide yesterday at a Yale University-owned building in New Haven.

One person was described as being in critical condition. Another person was described as being in serious condition.

Officials say the situation could have been a much larger problem, with the amount of carbon monoxide found in the building being 10 times the amount that triggers an alarm.

They believe the source of the carbon monoxide was a propane-fueled saw that was used by workers to cut concrete. Fumes were not escaping the building.

Even though the incident was not caused by an issue with home heating, officials are offering a reminder that carbon monoxide is a common winter danger. Health officials are reminding people to never use a generator indoors, to never start a car inside the garage and to clear your car's exhaust pipes of snow and ice.

Carbon monoxide is a colorless and odorless gas. Symptoms of carbon monoxide exposure include headache, dizziness and nausea - thought the Department of Public Health says the only way to know if carbon monoxide exposure is to blame is by installing a detector.