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Carbon-monoxide (CO) alarms should be in every home. A growing number of states and cities now require them, The latest models offer more ways to protect you and your family from this odorless, colorless gas, which kills roughly 500 Americans each year.
CO alarms beep when levels reach 70 parts per million (ppm) for an hour, sooner at higher levels, based on a voluntary industry standard. Furnaces, water heaters, and other fuel-burning appliances are often the culprits.
You may not notice ill effects at that level. But levels of 150 ppm over that time often cause headaches and other flulike effects, while 400 ppm can cause loss of consciousness, followed ...