The cause of the carbon monoxide leak in a home on the 300 block of Avenue T North Wednesday is still undetermined.

Saskatoon Assistant Fire Chief Wayne Rodger says SaskEnergy put in carbon monoxide detectors as a courtesy but have locked down the furnace and water heater until they are inspected by an expert to determine where the leak originated.

There were no carbon monoxide detectors in the home.

When 9-1-1 got the call, one person was unconscious and others in the home reported being dizzy as well as nauseous. Nine people, which included four children, were taken to hospital. They have been discharged.

When firefighters arrived around 9:20 a.m. Wednesday they measured carbon monoxide at the doorway as having levels of over 100 parts per million. A further search indicated readings inside of 160 to 190 parts per million of carbon monoxide.

Assistant Chief Rodger says generally speaking if all your appliances are functioning normally, most homes would have a reading of 0 as it pertains to carbon monoxide.

He says that would change slightly if there was a smoker who lived in the home because of the combustion and exposure to tobacco.

The Saskatoon Fire Department stresses that a functioning carbon monoxide alarm can be the difference in preventing tragedy. They point out the gas is colourless, odourless and tasteless but the symptoms include headache, fatigue, confusion, dizziness, nausea and vomiting.