How to interpret the leds across the top of the DIY monitors

What does each of the Leds at the top of the DIY monitor mean . On the right are a number of leds that indicate the air quality. On the left is one led that occasionally lights up and it appears to be purple or mauve. What does this one indicate?

These are explained on the dashboard:
https://app.airgradient.com/dashboard/about

Then click on “Monitor Error Help”

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