Air quality: add section on state (#34676)

* Air quality: add section on state

* Update source/_integrations/air_quality.markdown

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@ -27,3 +27,7 @@ The platforms cover the following levels (if they are available):
- The NO2 (nitrogen dioxide) level.
{% include integrations/building_block_integration.md %}
## The state of an air quality entity
The state of an air quality entity represents the concentration of particles in the air that are 2.5 microns or fewer in diameter. The state is a number. The number is followed by the unit of measurement (micrograms per cubic meter: "µg/m³"). For example, *PM2.5: 4 µg/m³*. In this example, the state is 4.