Building Management Systems
The primary indoor source of CO2 in office buildings is the breathing of the building’s occupants. CO₂ concentration in office buildings typically ranges from 400 to 2,500 ppm. With CO2 measuring, it is possible to control individual fans, dampers, valves etc., which create a better indoor environment and energy savings. A common application is controlling ventilation in rooms with varying numbers of people, such as offices, classrooms, and cinemas.
Indoor air quality also improves due to a reduction in the number of viruses and bacteria. Ventilating a room also reduces the number of particles occurring indoors.
World Health Organization
In the publication “School Environment: Policies Current Status”, the World Health Organization (WHO) states that good indoor air quality, where carbon dioxide is one of the focus areas, is the basis of lower rates of absenteeism among students and teachers, stronger academic performance, better teacher retention and job satisfaction, cost savings in many areas including building maintenance, and less sick leave.
You can also read a thought-provoking article about a study done on the air quality during Thanksgiving in The New Yorker.