diff --git a/homeassistant/components/smartthings/sensor.py b/homeassistant/components/smartthings/sensor.py
index ff6e7f252b0..22fdf3084c8 100644
--- a/homeassistant/components/smartthings/sensor.py
+++ b/homeassistant/components/smartthings/sensor.py
@@ -951,6 +951,7 @@ UNITS = {
     "F": UnitOfTemperature.FAHRENHEIT,
     "lux": LIGHT_LUX,
     "mG": None,
+    "μg/m^3": CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
 }
 
 
diff --git a/tests/components/smartthings/fixtures/device_status/da_ac_rac_100001.json b/tests/components/smartthings/fixtures/device_status/da_ac_rac_100001.json
index 305624e5b3b..5c062d904bb 100644
--- a/tests/components/smartthings/fixtures/device_status/da_ac_rac_100001.json
+++ b/tests/components/smartthings/fixtures/device_status/da_ac_rac_100001.json
@@ -146,10 +146,14 @@
       },
       "dustSensor": {
         "dustLevel": {
-          "value": null
+          "value": 46,
+          "unit": "\u03bcg/m^3",
+          "timestamp": "2025-03-06T16:01:49.656000+00:00"
         },
         "fineDustLevel": {
-          "value": null
+          "value": 10,
+          "unit": "\u03bcg/m^3",
+          "timestamp": "2025-03-06T16:01:49.656000+00:00"
         }
       },
       "thermostatCoolingSetpoint": {
diff --git a/tests/components/smartthings/snapshots/test_sensor.ambr b/tests/components/smartthings/snapshots/test_sensor.ambr
index ba2a21fe86b..fa9af0f2812 100644
--- a/tests/components/smartthings/snapshots/test_sensor.ambr
+++ b/tests/components/smartthings/snapshots/test_sensor.ambr
@@ -1479,7 +1479,7 @@
     'last_changed': <ANY>,
     'last_reported': <ANY>,
     'last_updated': <ANY>,
-    'state': 'unknown',
+    'state': '46',
   })
 # ---
 # name: test_all_entities[da_ac_rac_100001][sensor.corridor_a_c_pm2_5-entry]
@@ -1531,7 +1531,7 @@
     'last_changed': <ANY>,
     'last_reported': <ANY>,
     'last_updated': <ANY>,
-    'state': 'unknown',
+    'state': '10',
   })
 # ---
 # name: test_all_entities[da_ac_rac_100001][sensor.corridor_a_c_temperature-entry]