Carbon dioxide accumulation inside vehicles (2017)
The study examines CO2 levels in vehicles, noting that recirculated air can increase concentrations, especially during longer trips or with more occupants. Recommendations include mixing outside air to improve air quality.
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The study investigates carbon dioxide (CO2) accumulation in vehicles, focusing on how ventilation settings and driving conditions affect CO2 levels. It highlights that closing windows and using recirculated cabin air can limit the influx of external pollutants but may lead to increased CO2 concentrations due to occupant exhalation. Key factors influencing CO2 levels include ventilation settings, vehicle age, speed, cabin volume, trip duration, and the number of occupants. The research identifies that the recirculation (RC) setting is the primary cause of CO2 accumulation, with levels potentially exceeding thresholds linked to cognitive impairments, such as fatigue and concentration difficulties. While most average-duration commutes with one or two occupants do not reach the 2500 ppm threshold associated with adverse effects, longer trips or those with multiple passengers pose a greater risk. To mitigate CO2 buildup, it is recommended that RC ventilation be periodically interrupted or mixed with outside air during longer journeys or when multiple occupants are present. The findings underscore the importance of managing in-vehicle air quality to prevent cognitive and physiological impacts on drivers and passengers.
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