WiFi Traffic Distribution Colors on Unifi Dashboard

Good day
What do the colors under WiFi Traffic Distribution represent on the UNIFI Dashboard?

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From my understanding, it seems to be about the quality of service on the channel. If there is a lot of traffic or interference it goes pale green/yellow. Then orange. Not sure if there is anything worse, maybe red? The darker green is near perfect service. If I am a bit off, I am sure someone can correct me. My 2.4 gets a ton of interference from surrounding homes, so it rarely is anything but that pale green/yellow color. 5ghz varies depending on what access point everything in the house decides to use and who is using it.

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+1 for @Prophet4NO1 's answer. It is certainly affected by interference, not sure if other things affect it or not but I wouldn’t be worried by light green over dark green. If you get to yellow or red then start investigating.