Add (all important and now missing) value for main pollutants to air visual integration

Feature Requests
1

continuing from No state/value for Air-visual integration main sensor?

please add the sensor values for main_pollutant in the airvisual integration.

the sensors made:

02

misses the most important value for the main-pollutant, on which the level and AQI are based.

example from my local station:

16

note the ‘6’ before µg/m³

more-info of 2.5

55

2

This is solved. Air visual does not communicate the pollutant values for the free plan. Nothing the card can do about it!