diff --git a/homeassistant/components/qbus/sensor.py b/homeassistant/components/qbus/sensor.py
index a6ac05c45d95..70953eff5225 100644
--- a/homeassistant/components/qbus/sensor.py
+++ b/homeassistant/components/qbus/sensor.py
@@ -22,15 +22,14 @@ from homeassistant.components.sensor import (
     SensorStateClass,
 )
 from homeassistant.const import (
-    CONCENTRATION_PARTS_PER_MILLION,
     LIGHT_LUX,
-    PERCENTAGE,
     UnitOfElectricCurrent,
     UnitOfElectricPotential,
     UnitOfEnergy,
     UnitOfLength,
     UnitOfPower,
     UnitOfPressure,
+    UnitOfRatio,
     UnitOfSoundPressure,
     UnitOfSpeed,
     UnitOfTemperature,
@@ -126,7 +125,7 @@ _GAUGE_VARIANT_DESCRIPTIONS = {
     "AIRQUALITY": SensorEntityDescription(
         key="airquality",
         device_class=SensorDeviceClass.CO2,
-        native_unit_of_measurement=CONCENTRATION_PARTS_PER_MILLION,
+        native_unit_of_measurement=UnitOfRatio.PARTS_PER_MILLION,
         state_class=SensorStateClass.MEASUREMENT,
     ),
     "CURRENT": SensorEntityDescription(
@@ -156,7 +155,7 @@ _GAUGE_VARIANT_DESCRIPTIONS = {
     "HUMIDITY": SensorEntityDescription(
         key="humidity",
         device_class=SensorDeviceClass.HUMIDITY,
-        native_unit_of_measurement=PERCENTAGE,
+        native_unit_of_measurement=UnitOfRatio.PERCENTAGE,
         state_class=SensorStateClass.MEASUREMENT,
     ),
     "LIGHT": SensorEntityDescription(
@@ -353,7 +352,7 @@ class QbusHumiditySensor(QbusEntity, SensorEntity):
 
     _attr_device_class = SensorDeviceClass.HUMIDITY
     _attr_name = None
-    _attr_native_unit_of_measurement = PERCENTAGE
+    _attr_native_unit_of_measurement = UnitOfRatio.PERCENTAGE
     _attr_state_class = SensorStateClass.MEASUREMENT
 
     @override
@@ -382,7 +381,7 @@ class QbusVentilationSensor(QbusEntity, SensorEntity):
 
     _attr_device_class = SensorDeviceClass.CO2
     _attr_name = None
-    _attr_native_unit_of_measurement = CONCENTRATION_PARTS_PER_MILLION
+    _attr_native_unit_of_measurement = UnitOfRatio.PARTS_PER_MILLION
     _attr_state_class = SensorStateClass.MEASUREMENT
     _attr_suggested_display_precision = 0
 
diff --git a/tests/components/qbus/snapshots/test_sensor.ambr b/tests/components/qbus/snapshots/test_sensor.ambr
index 2a92f6af6020..d2623f88e34f 100644
--- a/tests/components/qbus/snapshots/test_sensor.ambr
+++ b/tests/components/qbus/snapshots/test_sensor.ambr
@@ -267,7 +267,7 @@
     'supported_features': 0,
     'translation_key': None,
     'unique_id': 'ctd_000001_94-1',
-    'unit_of_measurement': '%',
+    'unit_of_measurement': <UnitOfRatio.PERCENTAGE: '%'>,
   })
 # ---
 # name: test_sensor[sensor.kitchen_vochtigheid_keuken-state]
@@ -276,7 +276,7 @@
       <EntityStateAttribute.DEVICE_CLASS: 'device_class'>: 'humidity',
       <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Vochtigheid Keuken',
       <SensorEntityCapabilityAttribute.STATE_CLASS: 'state_class'>: <SensorStateClass.MEASUREMENT: 'measurement'>,
-      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: '%',
+      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: <UnitOfRatio.PERCENTAGE: '%'>,
     }),
     'context': <ANY>,
     'entity_id': 'sensor.kitchen_vochtigheid_keuken',
@@ -441,7 +441,7 @@
     'supported_features': 0,
     'translation_key': None,
     'unique_id': 'ctd_000001_224',
-    'unit_of_measurement': 'ppm',
+    'unit_of_measurement': <UnitOfRatio.PARTS_PER_MILLION: 'ppm'>,
   })
 # ---
 # name: test_sensor[sensor.luchtsensor-state]
@@ -450,7 +450,7 @@
       <EntityStateAttribute.DEVICE_CLASS: 'device_class'>: 'carbon_dioxide',
       <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Luchtsensor',
       <SensorEntityCapabilityAttribute.STATE_CLASS: 'state_class'>: <SensorStateClass.MEASUREMENT: 'measurement'>,
-      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: 'ppm',
+      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: <UnitOfRatio.PARTS_PER_MILLION: 'ppm'>,
     }),
     'context': <ANY>,
     'entity_id': 'sensor.luchtsensor',
@@ -615,7 +615,7 @@
     'supported_features': 0,
     'translation_key': None,
     'unique_id': 'ctd_000001_82',
-    'unit_of_measurement': 'ppm',
+    'unit_of_measurement': <UnitOfRatio.PARTS_PER_MILLION: 'ppm'>,
   })
 # ---
 # name: test_sensor[sensor.tuin_luchtkwaliteit-state]
@@ -624,7 +624,7 @@
       <EntityStateAttribute.DEVICE_CLASS: 'device_class'>: 'carbon_dioxide',
       <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Luchtkwaliteit',
       <SensorEntityCapabilityAttribute.STATE_CLASS: 'state_class'>: <SensorStateClass.MEASUREMENT: 'measurement'>,
-      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: 'ppm',
+      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: <UnitOfRatio.PARTS_PER_MILLION: 'ppm'>,
     }),
     'context': <ANY>,
     'entity_id': 'sensor.tuin_luchtkwaliteit',