carbon monoxide - headache & puke - how dangerous?

While contractors were working in my basement today, the carbon monoxide alarms in my house went off (they were evidently using a combustion engine without proper ventilation). My wife heard the alarm upstairs by the bedrooms and then told the contractors, grabbed the baby and dogs, and left. Later that night I found out that the exposure was high enough that the guys working in the basement had h...click here to continue

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