@MallocArray did you get or find any clarification to your questions about the custom calibration methods in the end? I am trying to use them but just like you, am finding the terminologies and explanations slightly confusing.
I did not. Right now I’m assuming applying the PM2.5 calibration based on the PM 0.3 count first and then applying the EPA correction after that, but I haven’t dug deep enough to know if that is exactly the same as what the stock firmware is doing
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