diff --git a/homeassistant/components/awair/const.py b/homeassistant/components/awair/const.py
index 2853ef9dd6c..1841a167a50 100644
--- a/homeassistant/components/awair/const.py
+++ b/homeassistant/components/awair/const.py
@@ -18,6 +18,7 @@ from homeassistant.const import (
     DEVICE_CLASS_TEMPERATURE,
     LIGHT_LUX,
     PERCENTAGE,
+    SOUND_PRESSURE_WEIGHTED_DBA,
     TEMP_CELSIUS,
 )
 
@@ -72,7 +73,7 @@ SENSOR_TYPES = {
     API_SPL_A: {
         ATTR_DEVICE_CLASS: None,
         ATTR_ICON: "mdi:ear-hearing",
-        ATTR_UNIT: "dBa",
+        ATTR_UNIT: SOUND_PRESSURE_WEIGHTED_DBA,
         ATTR_LABEL: "Sound level",
         ATTR_UNIQUE_ID: "sound_level",
     },
diff --git a/homeassistant/components/demo/__init__.py b/homeassistant/components/demo/__init__.py
index eef341a9c8b..db53c1c528f 100644
--- a/homeassistant/components/demo/__init__.py
+++ b/homeassistant/components/demo/__init__.py
@@ -2,7 +2,11 @@
 import asyncio
 
 from homeassistant import bootstrap, config_entries
-from homeassistant.const import ATTR_ENTITY_ID, EVENT_HOMEASSISTANT_START
+from homeassistant.const import (
+    ATTR_ENTITY_ID,
+    EVENT_HOMEASSISTANT_START,
+    SOUND_PRESSURE_DB,
+)
 import homeassistant.core as ha
 
 DOMAIN = "demo"
@@ -119,7 +123,7 @@ async def async_setup(hass, config):
                         "min": 0,
                         "max": 10,
                         "name": "Allowed Noise",
-                        "unit_of_measurement": "dB",
+                        "unit_of_measurement": SOUND_PRESSURE_DB,
                     }
                 }
             },
diff --git a/homeassistant/components/isy994/const.py b/homeassistant/components/isy994/const.py
index ed40c7eb289..34b89baad68 100644
--- a/homeassistant/components/isy994/const.py
+++ b/homeassistant/components/isy994/const.py
@@ -71,6 +71,8 @@ from homeassistant.const import (
     PRESSURE_MBAR,
     SERVICE_LOCK,
     SERVICE_UNLOCK,
+    SOUND_PRESSURE_DB,
+    SOUND_PRESSURE_WEIGHTED_DBA,
     SPEED_INCHES_PER_DAY,
     SPEED_INCHES_PER_HOUR,
     SPEED_KILOMETERS_PER_HOUR,
@@ -341,8 +343,8 @@ UOM_FRIENDLY_NAME = {
     "8": VOLUME_CUBIC_METERS,
     "9": TIME_DAYS,
     "10": TIME_DAYS,
-    "12": "dB",
-    "13": "dB A",
+    "12": SOUND_PRESSURE_DB,
+    "13": SOUND_PRESSURE_WEIGHTED_DBA,
     "14": DEGREE,
     "16": "macroseismic",
     "17": TEMP_FAHRENHEIT,
diff --git a/homeassistant/components/mysensors/sensor.py b/homeassistant/components/mysensors/sensor.py
index 1cb2b632362..467ab761124 100644
--- a/homeassistant/components/mysensors/sensor.py
+++ b/homeassistant/components/mysensors/sensor.py
@@ -20,6 +20,7 @@ from homeassistant.const import (
     MASS_KILOGRAMS,
     PERCENTAGE,
     POWER_WATT,
+    SOUND_PRESSURE_DB,
     TEMP_CELSIUS,
     TEMP_FAHRENHEIT,
     VOLT,
@@ -53,7 +54,7 @@ SENSORS: dict[str, list[str | None] | dict[str, list[str | None]]] = {
     "V_FLOW": [LENGTH_METERS, "mdi:gauge", None],
     "V_VOLUME": [f"{VOLUME_CUBIC_METERS}", None, None],
     "V_LEVEL": {
-        "S_SOUND": ["dB", "mdi:volume-high", None],
+        "S_SOUND": [SOUND_PRESSURE_DB, "mdi:volume-high", None],
         "S_VIBRATION": [FREQUENCY_HERTZ, None, None],
         "S_LIGHT_LEVEL": [LIGHT_LUX, "mdi:white-balance-sunny", None],
     },
diff --git a/homeassistant/components/netatmo/sensor.py b/homeassistant/components/netatmo/sensor.py
index a6ba3fd1c57..035aa711a25 100644
--- a/homeassistant/components/netatmo/sensor.py
+++ b/homeassistant/components/netatmo/sensor.py
@@ -17,6 +17,7 @@ from homeassistant.const import (
     PERCENTAGE,
     PRESSURE_MBAR,
     SIGNAL_STRENGTH_DECIBELS_MILLIWATT,
+    SOUND_PRESSURE_DB,
     SPEED_KILOMETERS_PER_HOUR,
     TEMP_CELSIUS,
 )
@@ -92,7 +93,7 @@ SENSOR_TYPES = {
         None,
         False,
     ],
-    "noise": ["Noise", "Noise", "dB", "mdi:volume-high", None, True],
+    "noise": ["Noise", "Noise", SOUND_PRESSURE_DB, "mdi:volume-high", None, True],
     "humidity": ["Humidity", "Humidity", PERCENTAGE, None, DEVICE_CLASS_HUMIDITY, True],
     "rain": ["Rain", "Rain", LENGTH_MILLIMETERS, "mdi:weather-rainy", None, True],
     "sum_rain_1": [
diff --git a/homeassistant/components/point/sensor.py b/homeassistant/components/point/sensor.py
index 338ed275f50..dc34e1f9367 100644
--- a/homeassistant/components/point/sensor.py
+++ b/homeassistant/components/point/sensor.py
@@ -8,6 +8,7 @@ from homeassistant.const import (
     DEVICE_CLASS_TEMPERATURE,
     PERCENTAGE,
     PRESSURE_HPA,
+    SOUND_PRESSURE_WEIGHTED_DBA,
     TEMP_CELSIUS,
 )
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
@@ -24,7 +25,7 @@ SENSOR_TYPES = {
     DEVICE_CLASS_TEMPERATURE: (None, 1, TEMP_CELSIUS),
     DEVICE_CLASS_PRESSURE: (None, 0, PRESSURE_HPA),
     DEVICE_CLASS_HUMIDITY: (None, 1, PERCENTAGE),
-    DEVICE_CLASS_SOUND: ("mdi:ear-hearing", 1, "dBa"),
+    DEVICE_CLASS_SOUND: ("mdi:ear-hearing", 1, SOUND_PRESSURE_WEIGHTED_DBA),
 }
 
 
diff --git a/homeassistant/const.py b/homeassistant/const.py
index 3f07196d570..4e78e657ba6 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -467,6 +467,13 @@ PRESSURE_MBAR: Final[UnitPressureT] = UnitPressureT(UnitT("mbar"))
 PRESSURE_INHG: Final[UnitPressureT] = UnitPressureT(UnitT("inHg"))
 PRESSURE_PSI: Final[UnitPressureT] = UnitPressureT(UnitT("psi"))
 
+# Sound pressure units
+UnitSoundPressureT = NewType("UnitSoundPressureT", UnitT)
+SOUND_PRESSURE_DB: Final[UnitSoundPressureT] = UnitSoundPressureT(UnitT("dB"))
+SOUND_PRESSURE_WEIGHTED_DBA: Final[UnitSoundPressureT] = UnitSoundPressureT(
+    UnitT("dBa")
+)
+
 # Volume units
 UnitVolumeT = NewType("UnitVolumeT", UnitT)
 VOLUME_LITERS: Final[UnitVolumeT] = UnitVolumeT(UnitT("L"))