diff --git a/homeassistant/components/nam/sensor.py b/homeassistant/components/nam/sensor.py
index ce3fdbf16a8..7cb5940b050 100644
--- a/homeassistant/components/nam/sensor.py
+++ b/homeassistant/components/nam/sensor.py
@@ -150,7 +150,9 @@ SENSORS: tuple[SensorEntityDescription, ...] = (
         key=ATTR_PMSX003_CAQI_LEVEL,
         name="PMSx003 CAQI level",
         icon="mdi:air-filter",
-        device_class="nam__caqi_level",
+        device_class=SensorDeviceClass.ENUM,
+        options=["very low", "low", "medium", "high", "very high"],
+        translation_key="caqi_level",
     ),
     SensorEntityDescription(
         key=ATTR_PMSX003_P0,
@@ -182,7 +184,9 @@ SENSORS: tuple[SensorEntityDescription, ...] = (
         key=ATTR_SDS011_CAQI_LEVEL,
         name="SDS011 CAQI level",
         icon="mdi:air-filter",
-        device_class="nam__caqi_level",
+        device_class=SensorDeviceClass.ENUM,
+        options=["very low", "low", "medium", "high", "very high"],
+        translation_key="caqi_level",
     ),
     SensorEntityDescription(
         key=ATTR_SDS011_P1,
@@ -221,7 +225,9 @@ SENSORS: tuple[SensorEntityDescription, ...] = (
         key=ATTR_SPS30_CAQI_LEVEL,
         name="SPS30 CAQI level",
         icon="mdi:air-filter",
-        device_class="nam__caqi_level",
+        device_class=SensorDeviceClass.ENUM,
+        options=["very low", "low", "medium", "high", "very high"],
+        translation_key="caqi_level",
     ),
     SensorEntityDescription(
         key=ATTR_SPS30_P0,
diff --git a/homeassistant/components/nam/strings.json b/homeassistant/components/nam/strings.json
index dab6eefb095..a37bcc2983e 100644
--- a/homeassistant/components/nam/strings.json
+++ b/homeassistant/components/nam/strings.json
@@ -37,5 +37,18 @@
       "reauth_successful": "[%key:common::config_flow::abort::reauth_successful%]",
       "reauth_unsuccessful": "Re-authentication was unsuccessful, please remove the integration and set it up again."
     }
+  },
+  "entity": {
+    "sensor": {
+      "caqi_level": {
+        "state": {
+          "very low": "Very low",
+          "low": "Low",
+          "medium": "Medium",
+          "high": "High",
+          "very high": "Very high"
+        }
+      }
+    }
   }
 }
diff --git a/homeassistant/components/nam/strings.sensor.json b/homeassistant/components/nam/strings.sensor.json
deleted file mode 100644
index ee53079d7d0..00000000000
--- a/homeassistant/components/nam/strings.sensor.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "state": {
-    "nam__caqi_level": {
-      "very low": "Very low",
-      "low": "Low",
-      "medium": "Medium",
-      "high": "High",
-      "very high": "Very high"
-    }
-  }
-}
diff --git a/homeassistant/components/nam/translations/en.json b/homeassistant/components/nam/translations/en.json
index 4378f8d6c51..4fd31471742 100644
--- a/homeassistant/components/nam/translations/en.json
+++ b/homeassistant/components/nam/translations/en.json
@@ -37,5 +37,18 @@
                 "description": "Set up Nettigo Air Monitor integration."
             }
         }
+    },
+    "entity": {
+        "sensor": {
+            "caqi_level": {
+                "state": {
+                    "high": "High",
+                    "low": "Low",
+                    "medium": "Medium",
+                    "very high": "Very high",
+                    "very low": "Very low"
+                }
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/tests/components/nam/test_sensor.py b/tests/components/nam/test_sensor.py
index dc9e9a76d76..271f8a7cb85 100644
--- a/tests/components/nam/test_sensor.py
+++ b/tests/components/nam/test_sensor.py
@@ -6,6 +6,7 @@ from nettigo_air_monitor import ApiError
 
 from homeassistant.components.nam.const import DOMAIN
 from homeassistant.components.sensor import (
+    ATTR_OPTIONS,
     ATTR_STATE_CLASS,
     DOMAIN as SENSOR_DOMAIN,
     SensorDeviceClass,
@@ -231,12 +232,20 @@ async def test_sensor(hass):
     state = hass.states.get("sensor.nettigo_air_monitor_pmsx003_caqi_level")
     assert state
     assert state.state == "very low"
-    assert state.attributes.get(ATTR_DEVICE_CLASS) == "nam__caqi_level"
+    assert state.attributes.get(ATTR_DEVICE_CLASS) == SensorDeviceClass.ENUM
+    assert state.attributes.get(ATTR_OPTIONS) == [
+        "very low",
+        "low",
+        "medium",
+        "high",
+        "very high",
+    ]
     assert state.attributes.get(ATTR_ICON) == "mdi:air-filter"
 
     entry = registry.async_get("sensor.nettigo_air_monitor_pmsx003_caqi_level")
     assert entry
     assert entry.unique_id == "aa:bb:cc:dd:ee:ff-pms_caqi_level"
+    assert entry.translation_key == "caqi_level"
 
     state = hass.states.get("sensor.nettigo_air_monitor_pmsx003_caqi")
     assert state
@@ -323,12 +332,20 @@ async def test_sensor(hass):
     state = hass.states.get("sensor.nettigo_air_monitor_sds011_caqi_level")
     assert state
     assert state.state == "very low"
-    assert state.attributes.get(ATTR_DEVICE_CLASS) == "nam__caqi_level"
+    assert state.attributes.get(ATTR_DEVICE_CLASS) == SensorDeviceClass.ENUM
+    assert state.attributes.get(ATTR_OPTIONS) == [
+        "very low",
+        "low",
+        "medium",
+        "high",
+        "very high",
+    ]
     assert state.attributes.get(ATTR_ICON) == "mdi:air-filter"
 
     entry = registry.async_get("sensor.nettigo_air_monitor_sds011_caqi_level")
     assert entry
     assert entry.unique_id == "aa:bb:cc:dd:ee:ff-sds011_caqi_level"
+    assert entry.translation_key == "caqi_level"
 
     state = hass.states.get("sensor.nettigo_air_monitor_sds011_particulate_matter_2_5")
     assert state
@@ -358,12 +375,20 @@ async def test_sensor(hass):
     state = hass.states.get("sensor.nettigo_air_monitor_sps30_caqi_level")
     assert state
     assert state.state == "medium"
-    assert state.attributes.get(ATTR_DEVICE_CLASS) == "nam__caqi_level"
+    assert state.attributes.get(ATTR_DEVICE_CLASS) == SensorDeviceClass.ENUM
+    assert state.attributes.get(ATTR_OPTIONS) == [
+        "very low",
+        "low",
+        "medium",
+        "high",
+        "very high",
+    ]
     assert state.attributes.get(ATTR_ICON) == "mdi:air-filter"
 
     entry = registry.async_get("sensor.nettigo_air_monitor_sps30_caqi_level")
     assert entry
     assert entry.unique_id == "aa:bb:cc:dd:ee:ff-sps30_caqi_level"
+    assert entry.translation_key == "caqi_level"
 
     state = hass.states.get("sensor.nettigo_air_monitor_sps30_particulate_matter_1_0")
     assert state