High levels of CO2 in a car aren't dangerous, but they can lead to drowsy driving and contribute to 10-30% of vehicle accidents.
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High CO2 Levels in Your Car Leads to Drowsy Driving
Flowchart of the proposed method for classifying the driver as alert or
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High CO2 Levels in Your Car Leads to Drowsy Driving
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Effects of Carbon Dioxide % VOL OF CO2 IN AIR EFFECT ON AN AVERAGE ADULT