diff --git a/homeassistant/components/purpleair/sensor.py b/homeassistant/components/purpleair/sensor.py
index 2173c67d2d27..e0108d74cb7c 100644
--- a/homeassistant/components/purpleair/sensor.py
+++ b/homeassistant/components/purpleair/sensor.py
@@ -13,11 +13,11 @@ from homeassistant.components.sensor import (
     SensorStateClass,
 )
 from homeassistant.const import (
-    CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
-    PERCENTAGE,
     SIGNAL_STRENGTH_DECIBELS_MILLIWATT,
     EntityCategory,
+    UnitOfDensity,
     UnitOfPressure,
+    UnitOfRatio,
     UnitOfTemperature,
     UnitOfTime,
     UnitOfVolume,
@@ -43,7 +43,7 @@ SENSOR_DESCRIPTIONS = [
     PurpleAirSensorEntityDescription(
         key="humidity",
         device_class=SensorDeviceClass.HUMIDITY,
-        native_unit_of_measurement=PERCENTAGE,
+        native_unit_of_measurement=UnitOfRatio.PERCENTAGE,
         state_class=SensorStateClass.MEASUREMENT,
         value_fn=lambda sensor: sensor.humidity,
     ),
@@ -74,7 +74,7 @@ SENSOR_DESCRIPTIONS = [
     PurpleAirSensorEntityDescription(
         key="pm1.0_mass_concentration",
         device_class=SensorDeviceClass.PM1,
-        native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+        native_unit_of_measurement=UnitOfDensity.MICROGRAMS_PER_CUBIC_METER,
         state_class=SensorStateClass.MEASUREMENT,
         value_fn=lambda sensor: sensor.pm1_0,
     ),
@@ -89,7 +89,7 @@ SENSOR_DESCRIPTIONS = [
     PurpleAirSensorEntityDescription(
         key="pm10.0_mass_concentration",
         device_class=SensorDeviceClass.PM10,
-        native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+        native_unit_of_measurement=UnitOfDensity.MICROGRAMS_PER_CUBIC_METER,
         state_class=SensorStateClass.MEASUREMENT,
         value_fn=lambda sensor: sensor.pm10_0,
     ),
@@ -104,7 +104,7 @@ SENSOR_DESCRIPTIONS = [
     PurpleAirSensorEntityDescription(
         key="pm2.5_mass_concentration",
         device_class=SensorDeviceClass.PM25,
-        native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+        native_unit_of_measurement=UnitOfDensity.MICROGRAMS_PER_CUBIC_METER,
         state_class=SensorStateClass.MEASUREMENT,
         value_fn=lambda sensor: sensor.pm2_5,
     ),