diff --git a/homeassistant/components/nam/const.py b/homeassistant/components/nam/const.py
index a9d044f2c1d..da4831de9e5 100644
--- a/homeassistant/components/nam/const.py
+++ b/homeassistant/components/nam/const.py
@@ -13,6 +13,9 @@ from homeassistant.const import (
     CONCENTRATION_PARTS_PER_MILLION,
     DEVICE_CLASS_CO2,
     DEVICE_CLASS_HUMIDITY,
+    DEVICE_CLASS_PM1,
+    DEVICE_CLASS_PM10,
+    DEVICE_CLASS_PM25,
     DEVICE_CLASS_PRESSURE,
     DEVICE_CLASS_SIGNAL_STRENGTH,
     DEVICE_CLASS_TEMPERATURE,
@@ -122,14 +125,14 @@ SENSORS: Final[tuple[SensorEntityDescription, ...]] = (
         key=ATTR_SDS011_P1,
         name=f"{DEFAULT_NAME} SDS011 Particulate Matter 10",
         native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
-        icon="mdi:blur",
+        device_class=DEVICE_CLASS_PM10,
         state_class=STATE_CLASS_MEASUREMENT,
     ),
     SensorEntityDescription(
         key=ATTR_SDS011_P2,
         name=f"{DEFAULT_NAME} SDS011 Particulate Matter 2.5",
         native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
-        icon="mdi:blur",
+        device_class=DEVICE_CLASS_PM25,
         state_class=STATE_CLASS_MEASUREMENT,
     ),
     SensorEntityDescription(
@@ -150,28 +153,28 @@ SENSORS: Final[tuple[SensorEntityDescription, ...]] = (
         key=ATTR_SPS30_P0,
         name=f"{DEFAULT_NAME} SPS30 Particulate Matter 1.0",
         native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
-        icon="mdi:blur",
+        device_class=DEVICE_CLASS_PM1,
         state_class=STATE_CLASS_MEASUREMENT,
     ),
     SensorEntityDescription(
         key=ATTR_SPS30_P1,
         name=f"{DEFAULT_NAME} SPS30 Particulate Matter 10",
         native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
-        icon="mdi:blur",
+        device_class=DEVICE_CLASS_PM10,
         state_class=STATE_CLASS_MEASUREMENT,
     ),
     SensorEntityDescription(
         key=ATTR_SPS30_P2,
         name=f"{DEFAULT_NAME} SPS30 Particulate Matter 2.5",
         native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
-        icon="mdi:blur",
+        device_class=DEVICE_CLASS_PM25,
         state_class=STATE_CLASS_MEASUREMENT,
     ),
     SensorEntityDescription(
         key=ATTR_SPS30_P4,
         name=f"{DEFAULT_NAME} SPS30 Particulate Matter 4.0",
         native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
-        icon="mdi:blur",
+        icon="mdi:molecule",
         state_class=STATE_CLASS_MEASUREMENT,
     ),
     SensorEntityDescription(
diff --git a/tests/components/nam/test_sensor.py b/tests/components/nam/test_sensor.py
index c5850ce719d..ce9a221007a 100644
--- a/tests/components/nam/test_sensor.py
+++ b/tests/components/nam/test_sensor.py
@@ -19,6 +19,9 @@ from homeassistant.const import (
     CONCENTRATION_PARTS_PER_MILLION,
     DEVICE_CLASS_CO2,
     DEVICE_CLASS_HUMIDITY,
+    DEVICE_CLASS_PM1,
+    DEVICE_CLASS_PM10,
+    DEVICE_CLASS_PM25,
     DEVICE_CLASS_PRESSURE,
     DEVICE_CLASS_SIGNAL_STRENGTH,
     DEVICE_CLASS_TEMPERATURE,
@@ -212,12 +215,12 @@ async def test_sensor(hass):
     state = hass.states.get("sensor.nettigo_air_monitor_sds011_particulate_matter_10")
     assert state
     assert state.state == "19"
+    assert state.attributes.get(ATTR_DEVICE_CLASS) == DEVICE_CLASS_PM10
     assert state.attributes.get(ATTR_STATE_CLASS) == STATE_CLASS_MEASUREMENT
     assert (
         state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
         == CONCENTRATION_MICROGRAMS_PER_CUBIC_METER
     )
-    assert state.attributes.get(ATTR_ICON) == "mdi:blur"
 
     entry = registry.async_get(
         "sensor.nettigo_air_monitor_sds011_particulate_matter_10"
@@ -228,12 +231,12 @@ async def test_sensor(hass):
     state = hass.states.get("sensor.nettigo_air_monitor_sds011_particulate_matter_2_5")
     assert state
     assert state.state == "11"
+    assert state.attributes.get(ATTR_DEVICE_CLASS) == DEVICE_CLASS_PM25
     assert state.attributes.get(ATTR_STATE_CLASS) == STATE_CLASS_MEASUREMENT
     assert (
         state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
         == CONCENTRATION_MICROGRAMS_PER_CUBIC_METER
     )
-    assert state.attributes.get(ATTR_ICON) == "mdi:blur"
 
     entry = registry.async_get(
         "sensor.nettigo_air_monitor_sds011_particulate_matter_2_5"
@@ -244,12 +247,12 @@ async def test_sensor(hass):
     state = hass.states.get("sensor.nettigo_air_monitor_sps30_particulate_matter_1_0")
     assert state
     assert state.state == "31"
+    assert state.attributes.get(ATTR_DEVICE_CLASS) == DEVICE_CLASS_PM1
     assert state.attributes.get(ATTR_STATE_CLASS) == STATE_CLASS_MEASUREMENT
     assert (
         state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
         == CONCENTRATION_MICROGRAMS_PER_CUBIC_METER
     )
-    assert state.attributes.get(ATTR_ICON) == "mdi:blur"
 
     entry = registry.async_get(
         "sensor.nettigo_air_monitor_sps30_particulate_matter_1_0"
@@ -260,12 +263,12 @@ async def test_sensor(hass):
     state = hass.states.get("sensor.nettigo_air_monitor_sps30_particulate_matter_10")
     assert state
     assert state.state == "21"
+    assert state.attributes.get(ATTR_DEVICE_CLASS) == DEVICE_CLASS_PM10
     assert state.attributes.get(ATTR_STATE_CLASS) == STATE_CLASS_MEASUREMENT
     assert (
         state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
         == CONCENTRATION_MICROGRAMS_PER_CUBIC_METER
     )
-    assert state.attributes.get(ATTR_ICON) == "mdi:blur"
 
     entry = registry.async_get("sensor.nettigo_air_monitor_sps30_particulate_matter_10")
     assert entry
@@ -274,12 +277,12 @@ async def test_sensor(hass):
     state = hass.states.get("sensor.nettigo_air_monitor_sps30_particulate_matter_2_5")
     assert state
     assert state.state == "34"
+    assert state.attributes.get(ATTR_DEVICE_CLASS) == DEVICE_CLASS_PM25
     assert state.attributes.get(ATTR_STATE_CLASS) == STATE_CLASS_MEASUREMENT
     assert (
         state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
         == CONCENTRATION_MICROGRAMS_PER_CUBIC_METER
     )
-    assert state.attributes.get(ATTR_ICON) == "mdi:blur"
 
     entry = registry.async_get(
         "sensor.nettigo_air_monitor_sps30_particulate_matter_2_5"
@@ -295,7 +298,7 @@ async def test_sensor(hass):
         state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
         == CONCENTRATION_MICROGRAMS_PER_CUBIC_METER
     )
-    assert state.attributes.get(ATTR_ICON) == "mdi:blur"
+    assert state.attributes.get(ATTR_ICON) == "mdi:molecule"
 
     entry = registry.async_get(
         "sensor.nettigo_air_monitor_sps30_particulate_matter_4_0"