Carbon monoxide (CO) is formed when fuels containing carbon such as wood, natural gas, oil, coal, gasoline, kerosene or propane are burned in a place where there isn't much air.  Can you think of ways that these fuels are used in different homes? Move your cursor over the house to find out some ways.
Most indoor carbon monoxide (CO) comes from kerosene and gas space heaters, stoves and furnaces. When appliances are working properly, have no leaks, and the room has plenty of fresh air, the amount of CO present is not a risk.
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