Some of you might have seen that we had temporarily rolled out a new firmware (version 3.1.8) but then got a few reports about issues with it so we rolled it back to the previous released version (3.1.4) to have time to address these issues.
One of them is that we currently implement compensation algorithms that make the PM sensor more accurate but it lead to numbers being different for Home Assistant users and it was also not fully implemented on our dashboard leading to confusion.
More details about these compensation algorithms can be found here:
Correction Algorithms
and a scientific analysis here:
Does the EPA Correction Algorithm for Wildfire Smoke PM2.5 Developed for PurpleAir Work for AirGradient Monitors?