The built-in particle sensor measures fine particle (PM2.5) levels in your room and changes the color of the air quality indicator (AQI) light on the front of the air purifier based on the current conditions. The light will show one of five colors; red (very polluted), orange (slightly polluted), yellow (moderate), green (good), and blue (excellent) to indicate air quality.
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How do dim the LED?
The air quality LED indicator can be turned off by setting the air purifier to Night mode, or adjusting the LED brightness setting in the Blueair app.
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Monitor your air quality in the Blueair App
If your air purifier is connected to the Blueair app, you can monitor your indoor PM2.5 levels over time in the reports section of the app. In the app, the concentration of PM2.5 is measured in micrograms (one-millionth of a gram) per cubic meter air or µg/m3.