diff --git a/homeassistant/components/airnow/sensor.py b/homeassistant/components/airnow/sensor.py
index ed879d32d4a..b0d8c69cff2 100644
--- a/homeassistant/components/airnow/sensor.py
+++ b/homeassistant/components/airnow/sensor.py
@@ -1,7 +1,11 @@
 """Support for the AirNow sensor service."""
 from __future__ import annotations
 
-from homeassistant.components.sensor import SensorEntity, SensorEntityDescription
+from homeassistant.components.sensor import (
+    STATE_CLASS_MEASUREMENT,
+    SensorEntity,
+    SensorEntityDescription,
+)
 from homeassistant.const import (
     ATTR_ATTRIBUTION,
     CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
@@ -31,18 +35,21 @@ SENSOR_TYPES: tuple[SensorEntityDescription, ...] = (
         icon="mdi:blur",
         name=ATTR_API_AQI,
         native_unit_of_measurement="aqi",
+        state_class=STATE_CLASS_MEASUREMENT,
     ),
     SensorEntityDescription(
         key=ATTR_API_PM25,
         icon="mdi:blur",
         name=ATTR_API_PM25,
         native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+        state_class=STATE_CLASS_MEASUREMENT,
     ),
     SensorEntityDescription(
         key=ATTR_API_O3,
         icon="mdi:blur",
         name=ATTR_API_O3,
         native_unit_of_measurement=CONCENTRATION_PARTS_PER_MILLION,
+        state_class=STATE_CLASS_MEASUREMENT,
     ),
 )