diff --git a/source/_integrations/air_quality.markdown b/source/_integrations/air_quality.markdown
index 0fc8d32f0a3..cf7a51531c4 100644
--- a/source/_integrations/air_quality.markdown
+++ b/source/_integrations/air_quality.markdown
@@ -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.