diff --git a/homeassistant/components/tradfri/sensor.py b/homeassistant/components/tradfri/sensor.py
index ebd90333292..acda0bec06d 100644
--- a/homeassistant/components/tradfri/sensor.py
+++ b/homeassistant/components/tradfri/sensor.py
@@ -54,6 +54,7 @@ class TradfriSensorEntityDescription(
 
 def _get_air_quality(device: Device) -> int | None:
     """Fetch the air quality value."""
+    assert device.air_purifier_control is not None
     if (
         device.air_purifier_control.air_purifiers[0].air_quality == 65535
     ):  # The sensor returns 65535 if the fan is turned off
@@ -64,8 +65,12 @@ def _get_air_quality(device: Device) -> int | None:
 
 def _get_filter_time_left(device: Device) -> int:
     """Fetch the filter's remaining life (in hours)."""
+    assert device.air_purifier_control is not None
     return round(
-        device.air_purifier_control.air_purifiers[0].filter_lifetime_remaining / 60
+        cast(
+            int, device.air_purifier_control.air_purifiers[0].filter_lifetime_remaining
+        )
+        / 60
     )