diff --git a/homeassistant/components/airthings/sensor.py b/homeassistant/components/airthings/sensor.py
index 4aab2307d9a..cc54430c417 100644
--- a/homeassistant/components/airthings/sensor.py
+++ b/homeassistant/components/airthings/sensor.py
@@ -22,6 +22,7 @@ from homeassistant.const import (
     DEVICE_CLASS_PRESSURE,
     DEVICE_CLASS_SIGNAL_STRENGTH,
     DEVICE_CLASS_TEMPERATURE,
+    ENTITY_CATEGORY_DIAGNOSTIC,
     PERCENTAGE,
     PRESSURE_MBAR,
     SIGNAL_STRENGTH_DECIBELS,
@@ -64,6 +65,7 @@ SENSORS: dict[str, SensorEntityDescription] = {
         key="battery",
         device_class=DEVICE_CLASS_BATTERY,
         native_unit_of_measurement=PERCENTAGE,
+        entity_category=ENTITY_CATEGORY_DIAGNOSTIC,
         name="Battery",
     ),
     "co2": SensorEntityDescription(
@@ -96,6 +98,7 @@ SENSORS: dict[str, SensorEntityDescription] = {
         device_class=DEVICE_CLASS_SIGNAL_STRENGTH,
         name="RSSI",
         entity_registry_enabled_default=False,
+        entity_category=ENTITY_CATEGORY_DIAGNOSTIC,
     ),
     "pm1": SensorEntityDescription(
         key="pm1",