Carbon Monoxide Safe Levels - Search
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    The safe levels of carbon monoxide exposure are:
    • 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
    • 9 ppm (parts-per-million) is the maximum indoor safe carbon monoxide level over 8 hours
    • 200 ppm or greater will cause physical symptoms and is fatal in hours
    • 800 ppm of CO or greater in the air is fatal within minutes
    • The National Institute for Occupational Safety and Health (NIOSH) has established a recommended exposure limit (REL) for carbon monoxide of 35 ppm (40 mg/m (3)) as an 8-hour TWA and 200 ppm (229 mg/m (3)) as a ceiling
    • The OSHA PEL for CO is 50 parts per million (ppm)
    • 35 ppm – the maximum allowable CO concentration for continuous prolonged exposure in any 8 hour period according to OSHA.
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