Ventilation system, indoor air quality, and health outcomes in Parisian modern office workers.

The effect of exposure to different types of ventilation were examined using a cross-sectional study, which took into account indoor environmental measurements of major contaminants and aeroallergens. The study selected three buildings ventilated with heating, ventilating and air conditioning, fan coil units and natural ventilation. Questionnaire were answered by 1144 employees. Found that HVAC and FCU systems were related to a marginally higher risk of non-specific symptoms compared with natural ventilation.