Air treatment integrated into the sludge storage shed is partially made of reinforced concrete with partition walls 2,20m high. Above this height, a galvanised metal structure holds a larch wood cladding and translucent polycarbonate siding materials. On the south side of the works there is a green planted filter with a surface of 135 m² it treats 72 000 m3/h of polluted air coming out from the 2 500 m² storage shed.