An intervention study of the impact of supply air filters on perceived air quality and health symptoms in a primary school

A field experiment was conducted in a primary school in 3 steps : first Personal Air Quality (PAQ) was assessed with the used bag-filters present in the air supply path, then when the bag filters had been removed, and finally when filters were refitted. The results showed that PAQ was better when the filters were removed, the author find it urgent to improve standards and filtration products for comfort ventilation.