diff --git a/homeassistant/components/number/const.py b/homeassistant/components/number/const.py
index 1b41146cd2a..bfb74d621c3 100644
--- a/homeassistant/components/number/const.py
+++ b/homeassistant/components/number/const.py
@@ -8,6 +8,7 @@ from typing import Final
 import voluptuous as vol
 
 from homeassistant.const import (
+    CONCENTRATION_GRAMS_PER_CUBIC_METER,
     CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
     CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER,
     CONCENTRATION_PARTS_PER_BILLION,
@@ -78,6 +79,11 @@ class NumberDeviceClass(StrEnum):
     """Device class for numbers."""
 
     # NumberDeviceClass should be aligned with SensorDeviceClass
+    ABSOLUTE_HUMIDITY = "absolute_humidity"
+    """Absolute humidity.
+
+    Unit of measurement: `g/m³`, `mg/m³`
+    """
 
     APPARENT_POWER = "apparent_power"
     """Apparent power.
@@ -452,6 +458,10 @@ class NumberDeviceClass(StrEnum):
 
 DEVICE_CLASSES_SCHEMA: Final = vol.All(vol.Lower, vol.Coerce(NumberDeviceClass))
 DEVICE_CLASS_UNITS: dict[NumberDeviceClass, set[type[StrEnum] | str | None]] = {
+    NumberDeviceClass.ABSOLUTE_HUMIDITY: {
+        CONCENTRATION_GRAMS_PER_CUBIC_METER,
+        CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER,
+    },
     NumberDeviceClass.APPARENT_POWER: set(UnitOfApparentPower),
     NumberDeviceClass.AQI: {None},
     NumberDeviceClass.AREA: set(UnitOfArea),
diff --git a/homeassistant/components/number/icons.json b/homeassistant/components/number/icons.json
index dcce09984bd..482b4bc6793 100644
--- a/homeassistant/components/number/icons.json
+++ b/homeassistant/components/number/icons.json
@@ -3,6 +3,9 @@
     "_": {
       "default": "mdi:ray-vertex"
     },
+    "absolute_humidity": {
+      "default": "mdi:water-opacity"
+    },
     "apparent_power": {
       "default": "mdi:flash"
     },
diff --git a/homeassistant/components/number/strings.json b/homeassistant/components/number/strings.json
index 998b9ffba38..1e4290f1d75 100644
--- a/homeassistant/components/number/strings.json
+++ b/homeassistant/components/number/strings.json
@@ -31,6 +31,9 @@
         }
       }
     },
+    "absolute_humidity": {
+      "name": "[%key:component::sensor::entity_component::absolute_humidity::name%]"
+    },
     "apparent_power": {
       "name": "[%key:component::sensor::entity_component::apparent_power::name%]"
     },
diff --git a/homeassistant/components/sensor/const.py b/homeassistant/components/sensor/const.py
index 994c29b6bbf..5f9d5ec9ca0 100644
--- a/homeassistant/components/sensor/const.py
+++ b/homeassistant/components/sensor/const.py
@@ -8,6 +8,7 @@ from typing import Final
 import voluptuous as vol
 
 from homeassistant.const import (
+    CONCENTRATION_GRAMS_PER_CUBIC_METER,
     CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
     CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER,
     CONCENTRATION_PARTS_PER_BILLION,
@@ -107,6 +108,12 @@ class SensorDeviceClass(StrEnum):
     """
 
     # Numerical device classes, these should be aligned with NumberDeviceClass
+    ABSOLUTE_HUMIDITY = "absolute_humidity"
+    """Absolute humidity.
+
+    Unit of measurement: `g/m³`, `mg/m³`
+    """
+
     APPARENT_POWER = "apparent_power"
     """Apparent power.
 
@@ -521,6 +528,7 @@ STATE_CLASSES_SCHEMA: Final = vol.All(vol.Lower, vol.Coerce(SensorStateClass))
 STATE_CLASSES: Final[list[str]] = [cls.value for cls in SensorStateClass]
 
 UNIT_CONVERTERS: dict[SensorDeviceClass | str | None, type[BaseUnitConverter]] = {
+    SensorDeviceClass.ABSOLUTE_HUMIDITY: MassVolumeConcentrationConverter,
     SensorDeviceClass.AREA: AreaConverter,
     SensorDeviceClass.ATMOSPHERIC_PRESSURE: PressureConverter,
     SensorDeviceClass.BLOOD_GLUCOSE_CONCENTRATION: BloodGlucoseConcentrationConverter,
@@ -554,6 +562,10 @@ UNIT_CONVERTERS: dict[SensorDeviceClass | str | None, type[BaseUnitConverter]] =
 }
 
 DEVICE_CLASS_UNITS: dict[SensorDeviceClass, set[type[StrEnum] | str | None]] = {
+    SensorDeviceClass.ABSOLUTE_HUMIDITY: {
+        CONCENTRATION_GRAMS_PER_CUBIC_METER,
+        CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER,
+    },
     SensorDeviceClass.APPARENT_POWER: set(UnitOfApparentPower),
     SensorDeviceClass.AQI: {None},
     SensorDeviceClass.AREA: set(UnitOfArea),
@@ -651,6 +663,7 @@ DEFAULT_PRECISION_LIMIT = 2
 # have 0 decimals, that one should be used and not mW, even though mW also should have
 # 0 decimals. Otherwise the smaller units will have more decimals than expected.
 UNITS_PRECISION = {
+    SensorDeviceClass.ABSOLUTE_HUMIDITY: (CONCENTRATION_GRAMS_PER_CUBIC_METER, 1),
     SensorDeviceClass.APPARENT_POWER: (UnitOfApparentPower.VOLT_AMPERE, 0),
     SensorDeviceClass.AREA: (UnitOfArea.SQUARE_CENTIMETERS, 0),
     SensorDeviceClass.ATMOSPHERIC_PRESSURE: (UnitOfPressure.PA, 0),
@@ -691,6 +704,7 @@ UNITS_PRECISION = {
 }
 
 DEVICE_CLASS_STATE_CLASSES: dict[SensorDeviceClass, set[SensorStateClass]] = {
+    SensorDeviceClass.ABSOLUTE_HUMIDITY: {SensorStateClass.MEASUREMENT},
     SensorDeviceClass.APPARENT_POWER: {SensorStateClass.MEASUREMENT},
     SensorDeviceClass.AQI: {SensorStateClass.MEASUREMENT},
     SensorDeviceClass.AREA: set(SensorStateClass),
diff --git a/homeassistant/components/sensor/device_condition.py b/homeassistant/components/sensor/device_condition.py
index 2b1eb350c3e..1ad5fe12e99 100644
--- a/homeassistant/components/sensor/device_condition.py
+++ b/homeassistant/components/sensor/device_condition.py
@@ -33,6 +33,7 @@ from . import ATTR_STATE_CLASS, DOMAIN, SensorDeviceClass
 
 DEVICE_CLASS_NONE = "none"
 
+CONF_IS_ABSOLUTE_HUMIDITY = "is_absolute_humidity"
 CONF_IS_APPARENT_POWER = "is_apparent_power"
 CONF_IS_AQI = "is_aqi"
 CONF_IS_AREA = "is_area"
@@ -88,6 +89,7 @@ CONF_IS_WIND_DIRECTION = "is_wind_direction"
 CONF_IS_WIND_SPEED = "is_wind_speed"
 
 ENTITY_CONDITIONS = {
+    SensorDeviceClass.ABSOLUTE_HUMIDITY: [{CONF_TYPE: CONF_IS_ABSOLUTE_HUMIDITY}],
     SensorDeviceClass.APPARENT_POWER: [{CONF_TYPE: CONF_IS_APPARENT_POWER}],
     SensorDeviceClass.AQI: [{CONF_TYPE: CONF_IS_AQI}],
     SensorDeviceClass.AREA: [{CONF_TYPE: CONF_IS_AREA}],
@@ -159,6 +161,7 @@ CONDITION_SCHEMA = vol.All(
             vol.Required(CONF_ENTITY_ID): cv.entity_id_or_uuid,
             vol.Required(CONF_TYPE): vol.In(
                 [
+                    CONF_IS_ABSOLUTE_HUMIDITY,
                     CONF_IS_APPARENT_POWER,
                     CONF_IS_AQI,
                     CONF_IS_AREA,
diff --git a/homeassistant/components/sensor/device_trigger.py b/homeassistant/components/sensor/device_trigger.py
index d44611a49db..ae2125962e8 100644
--- a/homeassistant/components/sensor/device_trigger.py
+++ b/homeassistant/components/sensor/device_trigger.py
@@ -32,6 +32,7 @@ from . import ATTR_STATE_CLASS, DOMAIN, SensorDeviceClass
 
 DEVICE_CLASS_NONE = "none"
 
+CONF_ABSOLUTE_HUMIDITY = "absolute_humidity"
 CONF_APPARENT_POWER = "apparent_power"
 CONF_AQI = "aqi"
 CONF_AREA = "area"
@@ -87,6 +88,7 @@ CONF_WIND_DIRECTION = "wind_direction"
 CONF_WIND_SPEED = "wind_speed"
 
 ENTITY_TRIGGERS = {
+    SensorDeviceClass.ABSOLUTE_HUMIDITY: [{CONF_TYPE: CONF_ABSOLUTE_HUMIDITY}],
     SensorDeviceClass.APPARENT_POWER: [{CONF_TYPE: CONF_APPARENT_POWER}],
     SensorDeviceClass.AQI: [{CONF_TYPE: CONF_AQI}],
     SensorDeviceClass.AREA: [{CONF_TYPE: CONF_AREA}],
@@ -159,6 +161,7 @@ TRIGGER_SCHEMA = vol.All(
             vol.Required(CONF_ENTITY_ID): cv.entity_id_or_uuid,
             vol.Required(CONF_TYPE): vol.In(
                 [
+                    CONF_ABSOLUTE_HUMIDITY,
                     CONF_APPARENT_POWER,
                     CONF_AQI,
                     CONF_AREA,
diff --git a/homeassistant/components/sensor/icons.json b/homeassistant/components/sensor/icons.json
index 05311868fc6..cea955e061c 100644
--- a/homeassistant/components/sensor/icons.json
+++ b/homeassistant/components/sensor/icons.json
@@ -3,6 +3,9 @@
     "_": {
       "default": "mdi:eye"
     },
+    "absolute_humidity": {
+      "default": "mdi:water-opacity"
+    },
     "apparent_power": {
       "default": "mdi:flash"
     },
diff --git a/homeassistant/components/sensor/strings.json b/homeassistant/components/sensor/strings.json
index ecaeb2504d9..c69bf99eff0 100644
--- a/homeassistant/components/sensor/strings.json
+++ b/homeassistant/components/sensor/strings.json
@@ -2,6 +2,7 @@
   "title": "Sensor",
   "device_automation": {
     "condition_type": {
+      "is_absolute_humidity": "Current {entity_name} absolute humidity",
       "is_apparent_power": "Current {entity_name} apparent power",
       "is_aqi": "Current {entity_name} air quality index",
       "is_area": "Current {entity_name} area",
@@ -57,6 +58,7 @@
       "is_wind_speed": "Current {entity_name} wind speed"
     },
     "trigger_type": {
+      "absolute_humidity": "{entity_name} absolute humidity changes",
       "apparent_power": "{entity_name} apparent power changes",
       "aqi": "{entity_name} air quality index changes",
       "area": "{entity_name} area changes",
@@ -148,6 +150,9 @@
     "duration": {
       "name": "Duration"
     },
+    "absolute_humidity": {
+      "name": "Absolute humidity"
+    },
     "apparent_power": {
       "name": "Apparent power"
     },
diff --git a/homeassistant/const.py b/homeassistant/const.py
index e6da8ba4a69..6b4f16c316f 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -910,6 +910,7 @@ class UnitOfPrecipitationDepth(StrEnum):
 
 
 # Concentration units
+CONCENTRATION_GRAMS_PER_CUBIC_METER: Final = "g/m³"
 CONCENTRATION_MICROGRAMS_PER_CUBIC_METER: Final = "µg/m³"
 CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER: Final = "mg/m³"
 CONCENTRATION_MICROGRAMS_PER_CUBIC_FOOT: Final = "μg/ft³"
diff --git a/homeassistant/util/unit_conversion.py b/homeassistant/util/unit_conversion.py
index d0830d1f8bb..5bde108dfc1 100644
--- a/homeassistant/util/unit_conversion.py
+++ b/homeassistant/util/unit_conversion.py
@@ -7,6 +7,7 @@ from functools import lru_cache
 from math import floor, log10
 
 from homeassistant.const import (
+    CONCENTRATION_GRAMS_PER_CUBIC_METER,
     CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
     CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER,
     CONCENTRATION_PARTS_PER_BILLION,
@@ -693,12 +694,14 @@ class MassVolumeConcentrationConverter(BaseUnitConverter):
 
     UNIT_CLASS = "concentration"
     _UNIT_CONVERSION: dict[str | None, float] = {
-        CONCENTRATION_MICROGRAMS_PER_CUBIC_METER: 1000.0,  # 1000 µg/m³ = 1 mg/m³
-        CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER: 1.0,
+        CONCENTRATION_MICROGRAMS_PER_CUBIC_METER: 1000000.0,  # 1000 µg/m³ = 1 mg/m³
+        CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER: 1000.0,  # 1000 mg/m³ = 1 g/m³
+        CONCENTRATION_GRAMS_PER_CUBIC_METER: 1.0,
     }
     VALID_UNITS = {
         CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
         CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER,
+        CONCENTRATION_GRAMS_PER_CUBIC_METER,
     }
 
 
diff --git a/tests/components/sensor/common.py b/tests/components/sensor/common.py
index 2df13b697da..1b9810a8250 100644
--- a/tests/components/sensor/common.py
+++ b/tests/components/sensor/common.py
@@ -7,6 +7,7 @@ from homeassistant.components.sensor import (
 )
 from homeassistant.components.sensor.const import DEVICE_CLASS_STATE_CLASSES
 from homeassistant.const import (
+    CONCENTRATION_GRAMS_PER_CUBIC_METER,
     CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
     CONCENTRATION_PARTS_PER_MILLION,
     DEGREE,
@@ -44,6 +45,7 @@ from homeassistant.const import (
 from tests.common import MockEntity
 
 UNITS_OF_MEASUREMENT = {
+    SensorDeviceClass.ABSOLUTE_HUMIDITY: CONCENTRATION_GRAMS_PER_CUBIC_METER,
     SensorDeviceClass.APPARENT_POWER: UnitOfApparentPower.VOLT_AMPERE,
     SensorDeviceClass.AQI: None,
     SensorDeviceClass.AREA: UnitOfArea.SQUARE_METERS,
diff --git a/tests/components/sensor/test_device_condition.py b/tests/components/sensor/test_device_condition.py
index 1c87845c2c7..da69610f4c5 100644
--- a/tests/components/sensor/test_device_condition.py
+++ b/tests/components/sensor/test_device_condition.py
@@ -125,7 +125,7 @@ async def test_get_conditions(
     conditions = await async_get_device_automations(
         hass, DeviceAutomationType.CONDITION, device_entry.id
     )
-    assert len(conditions) == 54
+    assert len(conditions) == 55
     assert conditions == unordered(expected_conditions)
 
 
diff --git a/tests/components/sensor/test_device_trigger.py b/tests/components/sensor/test_device_trigger.py
index bb57797e6dd..c39a5216f0f 100644
--- a/tests/components/sensor/test_device_trigger.py
+++ b/tests/components/sensor/test_device_trigger.py
@@ -126,7 +126,7 @@ async def test_get_triggers(
     triggers = await async_get_device_automations(
         hass, DeviceAutomationType.TRIGGER, device_entry.id
     )
-    assert len(triggers) == 54
+    assert len(triggers) == 55
     assert triggers == unordered(expected_triggers)
 
 
diff --git a/tests/util/test_unit_conversion.py b/tests/util/test_unit_conversion.py
index 7d0eb7226a0..537cfb33c31 100644
--- a/tests/util/test_unit_conversion.py
+++ b/tests/util/test_unit_conversion.py
@@ -8,6 +8,7 @@ from itertools import chain
 import pytest
 
 from homeassistant.const import (
+    CONCENTRATION_GRAMS_PER_CUBIC_METER,
     CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
     CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER,
     CONCENTRATION_PARTS_PER_BILLION,
@@ -762,6 +763,13 @@ _CONVERTED_VALUE: dict[
             2000,
             CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
         ),
+        # 3 g/m³ = 3000 mg/m³
+        (
+            3,
+            CONCENTRATION_GRAMS_PER_CUBIC_METER,
+            3000,
+            CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER,
+        ),
     ],
     VolumeConverter: [
         (5, UnitOfVolume.LITERS, 1.32086, UnitOfVolume.GALLONS),