CARBON MONOXIDE TEST CHART
Parts Per Million | % of CO in air | Inhalation time and toxic symptoms developed |
0 - 1 ppm | .0001% | Normal background levels |
9 ppm | .0009% | Maximum allowable concentration short term in living area (ASHRAE) |
25 ppm | .0025% | Maximum exposure TWA (Time Weighted Average) (ACGIH) in the workplace. |
50 ppm | .005% | Maximum exposure allowed (OSHA) in the workplace. |
200 ppm | .02% | Mild headache, fatigue, nausea and dizziness. |
400 ppm | .04% | Serious headache - other symptoms intensify. Life threatening after 3 hours. |
800 ppm | .08% | Dizziness, nausea and convulsions. Unconscious within 2 hours, dead within 2 to 3 hours. |
1600 ppm | .16% | Headache, dizziness and nausea. Death within 1 - 2 hours. |
3200 ppm | .32% | Headache, dizziness and nausea. Death within 1 hour. |
6400 ppm | .64% | Headache, dizziness and nausea. Death within 25 - 30 minutes. |
12,800 ppm | 1.28% | Death within 1 - 3 minutes. |
The Occupational Safety and Health Administration and the American Conference of Governmental Industrial Hygienists (ACGIH) have determined safe exposure limits for work with carbon monoxide. The Permissible Exposure Limits (PELS) are OSHA standards, which must be upheld by the employer at all times. In some cases, the Threshold Limit Value (TLV) established by ACGIH may be lower than the OSHA PEL. In these cases, employers must strive to keep exposures as low as reasonably achievable and follow the TLV'S. The PELs and TLV's are by the inhalation route of exposure.
Because carbon monoxide is slightly lighter than air and also because it may be found with warm, rising air, detectors should be placed on a wall about 5 feet above the floor. The detector may be placed on the ceiling. Do not place the detector right next to or over a fireplace or flame-producing appliance. Keep the detector out of the way of pets and children. Each floor needs a separate detector. If you getting a single carbon monoxide detector, place it near the sleeping area and make certain the alarm is loud enough to wake you up.
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PEL | TLV |
TWA | TWA |
50 ppm | 25 ppm |
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