AirGradient Forum

PM correction algorithms refer to RH, not clear if calibrated or raw

Components
#1

The current PM₂.₅ correction algorithms read as such (both in this blog post and the referenced documentation page):

PM2.5 = [0.524 x AGraw] – [0.0862 x RH] + 5.75

referencing the RH variable. Meanwhile the RH correction reads as such:

RH(calib) = RH(raw) * 1.259 + 7.34

So it isn’t super clear if the PM correction ought to be using the calibrated or raw RH readings. Could the formulas be adjusted to make this clearer?

Thank you.

P.S. I can’t, for some reason, respond to threads in the AirGradient Blog category.

#2

Thank you for this. Could you please try again to respond to the AirGradient Blog category. I changed some setting. Thank you.
(We will then answer it in the correct category).