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    Acceptable levels of carbon monoxide (CO) in indoor air:
    ny.gov+4
    • The World Health Organization recommends an average of nine parts per million (ppm) for any eight-hour period and below 25 ppm for any one-hour period.
      ny.gov
    • The National Institute for Occupational Safety and Health (NIOSH) recommends a limit of 35 ppm as an 8-hour time-weighted average (TWA) and 200 ppm as a ceiling.
      epa.gov
    • The Environmental Protection Agency (EPA) has established an environmental limit of 10 mg/m3 (9 ppmv) of carbon monoxide in air averaged over 8 hours.
      cdc.gov
    • WHO recommended limits include 9-10 ppm for no more than 8 hours, 25-35 ppm for no more than 1 hour, and 90-100 ppm for no more than 15 minutes.
      co2meter.com
    5 Sources
    Fact Sheet: What You Need to Know about Carbon Monoxide
    The World Health Organization recommends that the indoor air level for CO be below an average of nine parts per million (ppm) for any eight-hour period, and below 25 ppm for any on…
    The Official Website of New York State
    https://www.health.ny.gov/environmental/indoors/air/docs/carbon_monoxide_need_to_know.pdf
    1917.24 - Carbon monoxide. - Occupational Safety and Health Administration
    The carbon monoxide content of the atmosphere in a room, building, vehicle, railcar, or any enclosed space shall be maintained at not more than 50 parts per million (ppm) (0.005%) …
    Occupational Safety and Health Administration
    https://www.osha.gov/laws-regs/regulations/standardnumber/1917/1917.24
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    Carbon Monoxide's Impact on Indoor Air Quality | US EPA
    [NIOSH REL] 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…
    U.S. Environmental Protection Agency
    https://www.epa.gov/indoor-air-quality-iaq/carbon-monoxides-impact-indoor-air-quality
    Carbon Monoxide - ToxFAQs™ - Agency for Toxic Substances and Disease ...
    The EPA has established an environmental limit of 10 mg/m3 (9 parts per million by volume, ppmv) of carbon monoxide in air averaged over 8 hours and not to be exceeded more than on…
    CDC
    https://www.atsdr.cdc.gov/toxfaqs/tfacts201.pdf
    Carbon Monoxide Levels Chart | CO2Meter.com
    The WHO recommended limits are: 1 9-10 ppm for no more than 8 hours 2 25-35 ppm for no more than 1 hour 3 90-100 ppm for no more than 15 minutes
    CO2Meter.com
    https://www.co2meter.com/blogs/news/carbon-monoxide-levels-chart
    ny.gov
    osha.gov
    epa.gov
    cdc.gov
    co2meter.com

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