• Chart of Carbon Monoxide Levels and Symptoms

    Chart of Carbon Monoxide Levels and Symptoms

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    Concentration Symptoms
    35 ppm (0.0035%) Headache and dizziness within six to eight hours of constant exposure
    100 ppm (0.01%) Slight headache in two to three hours
    200 ppm (0.02%) Slight headache within two to three hours; loss of judgment
    400 ppm (0.04%) Frontal headache within one to two hours
    800 ppm (0.08%) Dizziness, nausea, and convulsions within 45 min; insensible within 2 hours
    1,600 ppm (0.16%) Headache, tachycardia, dizziness, and nausea within 20 min; death in less than 2 hours
    3,200 ppm (0.32%) Headache, dizziness and nausea in five to ten minutes. Death within 30 minutes.
    6,400 ppm (0.64%) Headache and dizziness in one to two minutes. Convulsions, respiratory arrest, and death in less than 20 minutes.

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