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CO2:
Usually, in a home, the CO2 levels can vary as much as 300 - 2000 ppm. Several studies have shown that CO2 does not seriously impact human health until levels reach approximately 15,000 ppm. This level is more than 40 times greater than the normal concentration of atmospheric CO2. At extremely high levels, i.e., 30,000 ppm (these concentrations are usually never be reached in a standard home), the symptoms can include nausea, dizziness, depression, convulsions, and vomiting. At extremely high levels, loss of consciousness may occur. The seriousness of the symptoms is dependent on the concentration of carbon dioxide and the length of time the individual is exposed. At CO2 concentrations of 100,000 ppm or more, death is almost certain. The moral of this story--make sure the settings levels in your DG4's cabin are safe!!!