The American Society of Heating, Refrigerating and Air-Conditioning Engineers ASHRAE is a voluntary world-wide organization that sets standards for members focused on building systems, energy efficiency, indoor air quality, refrigeration and sustainability. The peak CO level for employees engaged in roll-on roll-off operations during cargo loading and unloading is 200 ppm. Maritime workers, however, must be removed from exposure if the CO concentration in the atmosphere exceeds 100 ppm. The 8-hour PEL for CO in maritime operations is also 50 ppm. OSHA standards prohibit worker exposure to more than 50 parts of CO gas per million parts of air averaged during an 8-hour time period. The OSHA personal exposure limit (PEL) for CO is 50 parts per million (ppm). The Occupational Safety and Health Association OSHA sets standards for working conditions in the US including safe carbon monoxide levels. 25-35ppm for no more than 1 hour and 90-100 ppm for no more than 15 minutes.īelow we provide an easy to use reference for carbon monoxide levels chart.ĭownload a copy of the chart here. What is an acceptable level of carbon monoxide?įor indoor settings, the acceptable level of carbon monoxide is stated by WHO which recommends 9-10ppm for no more than 8 hours. UL, CSA, ANSI: Underwriters Laboratories.ACGIH: American Conference of Governmental Industrial Hygienists.NIOSH: National Institute for Occupational Safety and Health.ASHRAE: American Society of Heating, Refrigerating and Air-Conditioning Engineers.OSHA: Occupational Safety and Health Association.800 ppm of CO or greater in the air is fatal within minutesĬlick the links below to see each organization's safe carbon monoxide levels and exposure limits:.200 ppm or greater will cause physical symptoms and is fatal in hours.9 ppm (parts-per-million) is the maximum indoor safe carbon monoxide level over 8 hours. ![]() While the exact short and long term carbon monoxide levels recommended by ASHRAE, OSHA, NIOSH and other organizations differ, the consensus is that ![]() Even low carbon monoxide levels over long periods can have an impact on brain chemistry. CO gas competes with oxygen to bind with hemoglobin in the blood leading to a reduction of oxygen in the brain. The effects of carbon monoxide poisoning are well understood. ![]() Carbon monoxide exposure is the most common method of death by poisoning in the world.
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