The A3 has a Winsen ZH03B, and the data sheet says it’s supposed to provide separate readings for PM1.0, PM2.5 and PM10, but my A3 only reports PM2.5. Why is that? Can it be fixed with a firmware upgrade?

The reason that I noticed is if you compare the Oslo area on http://airindex.eea.europa.eu vs. uradmonitor.com, air quality is supposed to be kindof bad because of PM10 > 50, but uradmonitor is not detecting that, and showing that it’s all good because PM2.5 is not so bad. Norwegians do love their wood-burning stoves and fireplaces, so I suspect that with the slight cold spell over the last couple of days, there may be a bit of wood smoke. Also the annual vacuuming of sand and gravel from the paved roads has begun (they use it to provide traction on the ice during the winter, then collect it again in the spring).