diff --git a/homeassistant/components/google_air_quality/icons.json b/homeassistant/components/google_air_quality/icons.json
index fd28ef667bc..9db65f9a3bb 100644
--- a/homeassistant/components/google_air_quality/icons.json
+++ b/homeassistant/components/google_air_quality/icons.json
@@ -18,9 +18,6 @@
       },
       "ozone": {
         "default": "mdi:molecule"
-      },
-      "sulphur_dioxide": {
-        "default": "mdi:molecule"
       }
     }
   }
diff --git a/homeassistant/components/google_air_quality/sensor.py b/homeassistant/components/google_air_quality/sensor.py
index 7d58c9a2627..df923f6155c 100644
--- a/homeassistant/components/google_air_quality/sensor.py
+++ b/homeassistant/components/google_air_quality/sensor.py
@@ -173,8 +173,8 @@ AIR_QUALITY_SENSOR_TYPES: tuple[AirQualitySensorEntityDescription, ...] = (
     ),
     AirQualitySensorEntityDescription(
         key="so2",
-        translation_key="sulphur_dioxide",
         state_class=SensorStateClass.MEASUREMENT,
+        device_class=SensorDeviceClass.SULPHUR_DIOXIDE,
         native_unit_of_measurement_fn=lambda x: x.pollutants.so2.concentration.units,
         exists_fn=lambda x: "so2" in {p.code for p in x.pollutants},
         value_fn=lambda x: x.pollutants.so2.concentration.value,
diff --git a/homeassistant/components/google_air_quality/strings.json b/homeassistant/components/google_air_quality/strings.json
index 29486155b72..ed47c396b35 100644
--- a/homeassistant/components/google_air_quality/strings.json
+++ b/homeassistant/components/google_air_quality/strings.json
@@ -217,9 +217,6 @@
       "ozone": {
         "name": "[%key:component::sensor::entity_component::ozone::name%]"
       },
-      "sulphur_dioxide": {
-        "name": "[%key:component::sensor::entity_component::sulphur_dioxide::name%]"
-      },
       "uaqi": {
         "name": "Universal Air Quality Index"
       },
diff --git a/tests/components/google_air_quality/snapshots/test_sensor.ambr b/tests/components/google_air_quality/snapshots/test_sensor.ambr
index dd4ffe55bfb..821deaaf7cb 100644
--- a/tests/components/google_air_quality/snapshots/test_sensor.ambr
+++ b/tests/components/google_air_quality/snapshots/test_sensor.ambr
@@ -644,14 +644,14 @@
     'object_id_base': 'Sulphur dioxide',
     'options': dict({
     }),
-    'original_device_class': None,
+    'original_device_class': <SensorDeviceClass.SULPHUR_DIOXIDE: 'sulphur_dioxide'>,
     'original_icon': None,
     'original_name': 'Sulphur dioxide',
     'platform': 'google_air_quality',
     'previous_unique_id': None,
     'suggested_object_id': None,
     'supported_features': 0,
-    'translation_key': 'sulphur_dioxide',
+    'translation_key': None,
     'unique_id': 'so2_10.1_20.1',
     'unit_of_measurement': 'ppb',
   })
@@ -660,6 +660,7 @@
   StateSnapshot({
     'attributes': ReadOnlyDict({
       'attribution': 'Data provided by Google Air Quality',
+      'device_class': 'sulphur_dioxide',
       'friendly_name': 'Home Sulphur dioxide',
       'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
       'unit_of_measurement': 'ppb',