carbon monoxide hazardous levels - Search
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    Carbon monoxide exposure levels and their hazards:
    • Low level: 50 PPM and less
    • Mid-level: Between 51 PPM and 100 PPM
    • High level: Greater than 101 PPM if no one is experiencing symptoms
    • Dangerous level: Greater than 101 PPM if someone is experiencing symptoms
    • Maximum indoor safe carbon monoxide level over 8 hours: 9 ppm
    • Fatal levels: 200 ppm or greater (fatal in hours), 800 ppm or greater (fatal within minutes)
    • Symptoms become noticeable above 70 ppm and can include headache, fatigue, and nausea.
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