Please see attached a screenshot of my outdoor data for the last year. As you can see I applied the US EPA calibration three times (Only the first calibration change in September was an actual change, the other two I toggled back and forth between calibrated or not, so actually no significant uncalibrated data would have been saved in the interim).
My questions, does the calibration apply retrospectively?
Or is all the data to the left of the first calibration uncalibrated?
Do I actually have two different scales of data on my chart (pre and post Sept) or just one?
Thank you.
