Overcrowding and poor maintenance of heating and ventilation systems are the 2 main causes of poor air quality. Leading to the following familiar litany of symptoms in an unhealthy office workplace: colds, headaches, irritability, fatigue and dizziness. Never nice and certainly not part of a productive, ergonomic workplace.
Room humidity should be between 30-60%. Air circulation is also critical for productivity and sickness. Research has shown that when the amount of fresh air circulated through an office rose from 40m3 to 80m3 cubic meters per hour, productivity increased by 2% and short-term absenteeism dropped by an astounding 35%!