@alpha13 raised this question at PWS_Dashboard it does not read AQ sensor - #16 by pwsdashboard but more users in the past wondered about these differences:
Both blocks in your example show correct data.
Let me explain
There are two “items” displayed in the extra-sensor block
- The last number of measured pm2.5 of particles /m3
- The calculated AQ-index for pm2.5
The “official” block shows multiple AQ-indexes, in your case o3, pm10, pm2.5, no2, so2
The value in the top row is the highest calculated AQ-index value.
When you click on the “Air-Quality” (“Calidad del Aire” ) link in the bottom of the block, the pop-up shows the conversion tables for particles ->AQindex
In the @alpha13 example 37 ug/m3 for pm2.5 results in an AQindex > 100 to < 150
That is for one recent measurement, not an average value. A small disturbance from a gas- or wood heater, or even someone smoking in the garden will influence a measurtement.
Therefor there is the warning “Los efectos sobre la salud deben basarse únicamente en valores promedio de 24 horas.”
In English: “The health effects should be based on 24 hours average values only.”
So you will see differences between your device and the official measurements because
- They measure more AQ-components
- They average individual measurements
- They check the individual measurments for obvious “out-of-range” data
- They use professional measurement devices
We threfor show their data as most “official” stations supply a forecast also
Thanks for using the PWS_Dashboard
Wim
