VN57 Page 1 ©VERIS INDUSTRIES 2011 800.354.8556 or +1.503.598.4564 Veris Application Note N57 03113 Measuring CO 2 Levels in Schools Introduction One important factor when providing for the health and well-being of students is the level of carbon dioxide (CO 2 ) present in classrooms. Typical outdoor CO 2 levels are around 400 ppm. Due to human respiratory activity, indoor levels are higher than this, at approximately 600 to 800 pp

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