Signature bleue

The VOC Index runs on a scale from 1 to 500:

• A lower number indicates cleaner air
• A higher number indicates increased VOC activity
  

On the device display, this is translated into simplified air quality levels shown as L1 to L5, which correspond to the five AQI light colors.  

Blueair does not display VOC levels in ppb or µg/m³. Instead, the VOC sensor uses a VOC Index, which is a smart measurement based on how current VOC levels compare to your environment’s recent air history.

This index reflects VOC concentration relative to the past 24 hours, which helps the device recognize changes in air quality rather than relying on a fixed baseline.

VOC sensors can vary widely depending on calibration, environment, and sensitivity this is why we don't show VOC in ppb like other devices. The VOC Index method is designed to provide a more stable and meaningful indoor air quality indicator, based on trends and changes over time. Because of this, the VOC Index is not directly comparable to devices that show VOC levels in ppb.

Yes - depending on your settings.

By default, Auto Mode can respond to both:

• Particle pollution (PM2.5)
• VOC activity

If VOC levels rise (for example during cooking or cleaning), the device may increase fan speed to help clear the air more quickly. 

If you feel the fan increases speed too frequently, you can adjust Auto Mode settings in the app to respond to PM only instead and toggle off TVOC. 

Blueair Signature Medium models are equipped with a VOC sensor and can detect volatile organic compounds (VOCs) — gases released from common household sources such as cooking, cleaning products, sprays, paints, and fragrances.

AirSense uses an adaptive algorithm to determine how long each refresh cycle should run.
Here’s how it works:

AirSense starts by running a cycle between 10 and 25 minutes
If the device consistently detects “hidden” pollution after refreshing the room, it learns to run longer refresh cycles.