預設情況下，Node/Pro 僅顯示 AQI （空氣品質指數）。 In order to show PM2.5 concentration in µg/m3, go to the center button settings menu > 'Display' > 'Units' > 'PM2.5 concentration' > 'Display'.
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The PM2.5 concentration in µg/m3 will then display on the screen below the AQI number.