The staff of Dr. Natuk Birkan Primary & Secondary School reported that during school lessons many students frequently seemed tired and had problems concentrating. The staff was concerned that indoor air quality and exceeded CO2 levels in classrooms might be causing the problem.  

Research proves that most classrooms quickly exceed the allowed limit (1000ppm) for the CO2 concentration causing long lasting tiredness, difficulties to concentrate, headache, shortness of breath, sinus congestion, coughing, sneezing, dizziness, nausea and irritation of the eyes, nose, throat and skin which results in lowered performance and is specifically dangerous to student overall health since children are more sensitive to environmental factors. 

See what the school did to resolve the problem. Read the case study here