diff --git a/homeassistant/components/airly/sensor.py b/homeassistant/components/airly/sensor.py
index 9fb4e61dbdb..bbb501ae47b 100644
--- a/homeassistant/components/airly/sensor.py
+++ b/homeassistant/components/airly/sensor.py
@@ -118,7 +118,6 @@ SENSOR_TYPES: tuple[AirlySensorEntityDescription, ...] = (
     ),
     AirlySensorEntityDescription(
         key=ATTR_API_CO,
-        device_class=SensorDeviceClass.CO,
         name=ATTR_API_CO,
         native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
         state_class=SensorStateClass.MEASUREMENT,
diff --git a/tests/components/airly/test_sensor.py b/tests/components/airly/test_sensor.py
index d6bf4970130..9ac10f20fc3 100644
--- a/tests/components/airly/test_sensor.py
+++ b/tests/components/airly/test_sensor.py
@@ -108,7 +108,6 @@ async def test_sensor(hass, aioclient_mock):
         state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
         == CONCENTRATION_MICROGRAMS_PER_CUBIC_METER
     )
-    assert state.attributes.get(ATTR_DEVICE_CLASS) == SensorDeviceClass.CO
     assert state.attributes.get(ATTR_STATE_CLASS) == SensorStateClass.MEASUREMENT
 
     entry = registry.async_get("sensor.home_co")