Long term exposure to small amounts of CO can be dangerous, too! 12 years ago my sister and her college roommates were poisoned due to a faulty boiler in their apartment building, one person died and 6 others were severely poisoned, please take the smell seriously!!! We are thankful everyday for the persistence of my sister's neighbor who called 911 when she wasn't feeling well and suspected CO poisoning, after the college infirmary told her she had the flu.
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