diff --git a/homeassistant/components/number/const.py b/homeassistant/components/number/const.py
index e6abd3b4d390..4400e76191b7 100644
--- a/homeassistant/components/number/const.py
+++ b/homeassistant/components/number/const.py
@@ -265,7 +265,7 @@ class NumberDeviceClass(StrEnum):
     OZONE = "ozone"
     """Amount of O3.
 
-    Unit of measurement: `μg/m³`
+    Unit of measurement: `ppb` (parts per billion), `μg/m³`
     """
 
     PH = "ph"
@@ -523,7 +523,10 @@ DEVICE_CLASS_UNITS: dict[NumberDeviceClass, set[type[StrEnum] | str | None]] = {
     },
     NumberDeviceClass.NITROGEN_MONOXIDE: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
     NumberDeviceClass.NITROUS_OXIDE: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
-    NumberDeviceClass.OZONE: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
+    NumberDeviceClass.OZONE: {
+        CONCENTRATION_PARTS_PER_BILLION,
+        CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+    },
     NumberDeviceClass.PH: {None},
     NumberDeviceClass.PM1: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
     NumberDeviceClass.PM10: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
diff --git a/homeassistant/components/recorder/statistics.py b/homeassistant/components/recorder/statistics.py
index 3d7e814851ce..5e8c6302012e 100644
--- a/homeassistant/components/recorder/statistics.py
+++ b/homeassistant/components/recorder/statistics.py
@@ -60,6 +60,7 @@ from homeassistant.util.unit_conversion import (
     MassConverter,
     MassVolumeConcentrationConverter,
     NitrogenDioxideConcentrationConverter,
+    OzoneConcentrationConverter,
     PowerConverter,
     PressureConverter,
     ReactiveEnergyConverter,
@@ -228,6 +229,7 @@ _SECONDARY_UNIT_CONVERTERS: list[type[BaseUnitConverter]] = [
     CarbonMonoxideConcentrationConverter,
     NitrogenDioxideConcentrationConverter,
     TemperatureDeltaConverter,
+    OzoneConcentrationConverter,
     SulphurDioxideConcentrationConverter,
 ]
 
diff --git a/homeassistant/components/recorder/websocket_api.py b/homeassistant/components/recorder/websocket_api.py
index e2d83808887b..e497b073fdd5 100644
--- a/homeassistant/components/recorder/websocket_api.py
+++ b/homeassistant/components/recorder/websocket_api.py
@@ -34,6 +34,7 @@ from homeassistant.util.unit_conversion import (
     MassConverter,
     MassVolumeConcentrationConverter,
     NitrogenDioxideConcentrationConverter,
+    OzoneConcentrationConverter,
     PowerConverter,
     PressureConverter,
     ReactiveEnergyConverter,
@@ -94,6 +95,7 @@ UNIT_SCHEMA = vol.Schema(
         vol.Optional("nitrogen_dioxide"): vol.In(
             NitrogenDioxideConcentrationConverter.VALID_UNITS
         ),
+        vol.Optional("ozone"): vol.In(OzoneConcentrationConverter.VALID_UNITS),
         vol.Optional("power"): vol.In(PowerConverter.VALID_UNITS),
         vol.Optional("pressure"): vol.In(PressureConverter.VALID_UNITS),
         vol.Optional("reactive_energy"): vol.In(ReactiveEnergyConverter.VALID_UNITS),
diff --git a/homeassistant/components/sensor/const.py b/homeassistant/components/sensor/const.py
index 995531226dba..be6cc4ea3a53 100644
--- a/homeassistant/components/sensor/const.py
+++ b/homeassistant/components/sensor/const.py
@@ -64,6 +64,7 @@ from homeassistant.util.unit_conversion import (
     MassConverter,
     MassVolumeConcentrationConverter,
     NitrogenDioxideConcentrationConverter,
+    OzoneConcentrationConverter,
     PowerConverter,
     PressureConverter,
     ReactiveEnergyConverter,
@@ -302,7 +303,7 @@ class SensorDeviceClass(StrEnum):
     OZONE = "ozone"
     """Amount of O3.
 
-    Unit of measurement: `μg/m³`
+    Unit of measurement: `ppb` (parts per billion),`μg/m³`
     """
 
     PH = "ph"
@@ -565,6 +566,7 @@ UNIT_CONVERTERS: dict[SensorDeviceClass | str | None, type[BaseUnitConverter]] =
     SensorDeviceClass.ENERGY_STORAGE: EnergyConverter,
     SensorDeviceClass.GAS: VolumeConverter,
     SensorDeviceClass.NITROGEN_DIOXIDE: NitrogenDioxideConcentrationConverter,
+    SensorDeviceClass.OZONE: OzoneConcentrationConverter,
     SensorDeviceClass.POWER: PowerConverter,
     SensorDeviceClass.POWER_FACTOR: UnitlessRatioConverter,
     SensorDeviceClass.PRECIPITATION: DistanceConverter,
@@ -639,7 +641,10 @@ DEVICE_CLASS_UNITS: dict[SensorDeviceClass, set[type[StrEnum] | str | None]] = {
     },
     SensorDeviceClass.NITROGEN_MONOXIDE: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
     SensorDeviceClass.NITROUS_OXIDE: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
-    SensorDeviceClass.OZONE: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
+    SensorDeviceClass.OZONE: {
+        CONCENTRATION_PARTS_PER_BILLION,
+        CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+    },
     SensorDeviceClass.PH: {None},
     SensorDeviceClass.PM1: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
     SensorDeviceClass.PM10: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
diff --git a/homeassistant/util/unit_conversion.py b/homeassistant/util/unit_conversion.py
index d3989509ca6f..daae62861a41 100644
--- a/homeassistant/util/unit_conversion.py
+++ b/homeassistant/util/unit_conversion.py
@@ -104,6 +104,7 @@ _AMBIENT_IDEAL_GAS_MOLAR_VOLUME = (  # m3⋅mol⁻¹
 # Molar masses in g⋅mol⁻¹
 _CARBON_MONOXIDE_MOLAR_MASS = 28.01
 _NITROGEN_DIOXIDE_MOLAR_MASS = 46.0055
+_OZONE_MOLAR_MASS = 48.00
 _SULPHUR_DIOXIDE_MOLAR_MASS = 64.066
 
 
@@ -562,6 +563,22 @@ class ReactivePowerConverter(BaseUnitConverter):
     }
 
 
+class OzoneConcentrationConverter(BaseUnitConverter):
+    """Convert ozone ratio to mass per volume."""
+
+    UNIT_CLASS = "ozone"
+    _UNIT_CONVERSION: dict[str | None, float] = {
+        CONCENTRATION_PARTS_PER_BILLION: 1e9,
+        CONCENTRATION_MICROGRAMS_PER_CUBIC_METER: (
+            _OZONE_MOLAR_MASS / _AMBIENT_IDEAL_GAS_MOLAR_VOLUME * 1e6
+        ),
+    }
+    VALID_UNITS = {
+        CONCENTRATION_PARTS_PER_BILLION,
+        CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+    }
+
+
 class SpeedConverter(BaseUnitConverter):
     """Utility to convert speed values."""
 
diff --git a/tests/components/sensor/test_init.py b/tests/components/sensor/test_init.py
index 59ec2cb1966f..b25eaa0a4d0f 100644
--- a/tests/components/sensor/test_init.py
+++ b/tests/components/sensor/test_init.py
@@ -3109,7 +3109,6 @@ def test_device_class_converters_are_complete() -> None:
         SensorDeviceClass.MONETARY,
         SensorDeviceClass.NITROGEN_MONOXIDE,
         SensorDeviceClass.NITROUS_OXIDE,
-        SensorDeviceClass.OZONE,
         SensorDeviceClass.PH,
         SensorDeviceClass.PM1,
         SensorDeviceClass.PM10,
diff --git a/tests/util/test_unit_conversion.py b/tests/util/test_unit_conversion.py
index 2fbe10135d80..82a275e1d73f 100644
--- a/tests/util/test_unit_conversion.py
+++ b/tests/util/test_unit_conversion.py
@@ -57,6 +57,7 @@ from homeassistant.util.unit_conversion import (
     MassConverter,
     MassVolumeConcentrationConverter,
     NitrogenDioxideConcentrationConverter,
+    OzoneConcentrationConverter,
     PowerConverter,
     PressureConverter,
     ReactiveEnergyConverter,
@@ -93,6 +94,7 @@ _ALL_CONVERTERS: dict[type[BaseUnitConverter], list[str | None]] = {
         InformationConverter,
         MassConverter,
         ApparentPowerConverter,
+        OzoneConcentrationConverter,
         PowerConverter,
         PressureConverter,
         ReactiveEnergyConverter,
@@ -167,6 +169,11 @@ _GET_UNIT_RATIO: dict[type[BaseUnitConverter], tuple[str | None, str | None, flo
         CONCENTRATION_PARTS_PER_BILLION,
         1.912503,
     ),
+    OzoneConcentrationConverter: (
+        CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+        CONCENTRATION_PARTS_PER_BILLION,
+        1.995417,
+    ),
     PowerConverter: (UnitOfPower.WATT, UnitOfPower.KILO_WATT, 1000),
     PressureConverter: (UnitOfPressure.HPA, UnitOfPressure.INHG, 33.86389),
     ReactiveEnergyConverter: (
@@ -735,6 +742,20 @@ _CONVERTED_VALUE: dict[
         (1, UnitOfMass.STONES, 14, UnitOfMass.POUNDS),
         (1, UnitOfMass.STONES, 224, UnitOfMass.OUNCES),
     ],
+    OzoneConcentrationConverter: [
+        (
+            1,
+            CONCENTRATION_PARTS_PER_BILLION,
+            1.995417,
+            CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+        ),
+        (
+            120,
+            CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+            60.1378,
+            CONCENTRATION_PARTS_PER_BILLION,
+        ),
+    ],
     PowerConverter: [
         (10, UnitOfPower.KILO_WATT, 10000, UnitOfPower.WATT),
         (10, UnitOfPower.MEGA_WATT, 10e6, UnitOfPower.WATT),