A safe and healthy carbon dioxide level for indoor spaces is generally considered to be under 1,000 parts per million, with outdoor background levels typically hovering around 400 parts per million. When indoor CO2 concentrations rise above 1,000 ppm, it is a clear indicator of inadequate fresh air ventilation, which can lead to occupant complaints of stuffiness, fatigue, headaches, and decreased cognitive performance. If levels climb past 2,000 ppm, it causes noticeable drowsiness and impaired concentration. Maintaining safe indoor carbon dioxide levels requires ensuring a steady supply of fresh outdoor air through open windows, mechanical ventilation, or energy recovery ventilators.
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