Question about Dyson Cool Formaldehyde

This is what the manufacturer says:

The CADR is not a measure of the cleaning performance of an air purifier under real conditions (28.5 m³). Two additional fans increase the air distribution. Only one sensor measures the air quality.

The Dyson POLAR test goes further and measures cleaning performance in a room the size of a real living room (81m³). No extra fans. Nine different sensors measure air quality at different locations in the room.