After spending a decent amount on Sensibo equipment and finding its accuracy is laughably bad, I did a heap of research into PurpleAir and the other sensors on the market. I already had a couple of Aranet4 devices and wanted the same high level of accuracy they provided - and so it was really down to PurpleAir or AirGradient given the SenseAir and Planter sensors. I'd say clinched my decision - and I dropped quite a bit of money on 2 outdoors and 4 indoors, split between me and a friend.

Why didn't I do with PurpleAir? - The order above with AirGradient was about USD$800 (for kit form devices, excluding freight). PurpleAir for the same models is USD$1774. - PurpleAir seemed to require a Google login to put the devices on a map, and I don't like the big-vendor-lock-in. - Browsing the AirGradient forums, Achim (the founder) is really involved, and the open-source nature of the platform appealed.

For a (what appears to me to be, anyway!) small organisation, the quality and deliverable of the AirGradient system is exceptional. The equipment looks professional, joining it to the AirGradient dashboard is surprisingly easy, and the dashboard itself is really slick. It's fast, it works as direct icon on my iPhone, and does it's job (giving me key info) really well.

In saying all that, I'd better clarify I'm getting nothing out of this glowing review! I just love it when tech works well, as it should, and when it does it should be recognised and supported.