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If you burn gas, kerosene, or wood in your home to produce heat for cooking or warmth, you need to monitor the level of carbon monoxide. Carbon monoxide is odorless and can easily build up to dangerous levels. Ordinary carbon monoxide detectors don't sound an alarm until certain levels of carbon monoxide accumulate in the air. New monitors show the amount of carbon dioxide in the air at any given time, so you can take action well before levels reach the danger zone.