Yours failed after two years though? Mine is brand new. I think maybe my downstairs neighbor is smoking cigarettes in her unit.
I am noticing a PM2.5 reading of 156μg/m3. That seems… insanely high? How can I test the accuracy of the device?
Oh the PM2.5 reading started to work suddenly but Ozone is still a flat line.
Also the Ozone reading is at a constant 20ppb.