[softgrow]

I’ve looked at building one of these, but what new actionable information do you get? I’ve been wondering if it might say the room is dusty and then I could run the HEPA vacuum cleaner to bring it down. Or is this just for measurement geeks?

[joshefin]

You can use the PM measurement that the sensor outputs to calculate the Air Quality Index (for Europe: http://airindex.eea.europa.eu/) and for example, make it send you a notification when the pollution level goes up, so you can turn on the air purifier or vacuum or open the windows.