A concentration of 1% (10,000 parts per million or ppm) CO2 will induce drowsiness. Concentrations of 7% to 10% cause dizziness, headache, visual and hearing dysfunction, and unconsciousness before an hour’s exposure. Carbon dioxide levels are now close to 387 parts per million, which is interestingly, the highest level the earth has seen for 15 million years. For the past 800,000 years, CO2 levels stayed between 180 to 300 ppm.
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