Hi all, it makes sense that you get extra credibility/validity if you have 2 sensors (like the #plantower) and they agree (basically for any sensor!). But I wanted to try to break this down with as little jargon as possible -- are there other advantages? Does the Purple Air average the two, or how does it use the two data streams?
I also want to acknowledge that this has been addressed in parts in different questions at #purpleair and #plantower (and #simple-air-sensor) but it's come up from time to time, so I wanted to try to develop a simple answer in one place. Thank you all for helping make this information more accessible!
PA-II includes two laser sensors. An unknown algorithm estimates particulate concentration. I wouldn’t exclude further processing by PurpleAir, maybe matching against an accuracy estimate obtained correlating nearby certified sensors where available. This before finally making PM2.5 averages available on the map and through JSON API.