Great question—and the short answer is: No, switching between PM levels in the app does not affect how your Blue Signature air purifier functions.
The Blue Signature air purifier is equipped with advanced laser sensors that continuously monitor PM1, PM2.5, and PM10—three key categories of airborne particulate matter. In the Blueair app, you can toggle between these readings to see real-time air quality data for different particle sizes. However, this only changes what is displayed in the app; it does not change the filtration behavior of the device.
Regardless of which PM level you're viewing, the air purifier is always operating at full efficiency, removing particles as small as 0.1 microns from your indoor air—including smoke, dust, pollen, and other airborne pollutants.
In short, the display helps you better understand your air quality, while the purifier handles the rest—automatically and effectively.