diff --git a/homeassistant/components/co2signal/sensor.py b/homeassistant/components/co2signal/sensor.py
index e7ac138335b..bd8d94355fd 100644
--- a/homeassistant/components/co2signal/sensor.py
+++ b/homeassistant/components/co2signal/sensor.py
@@ -114,6 +114,13 @@ class CO2Sensor(update_coordinator.CoordinatorEntity[CO2SignalResponse], SensorE
             f"{coordinator.entry_id}_{description.unique_id or description.key}"
         )
 
+    @property
+    def available(self) -> bool:
+        """Return True if entity is available."""
+        return (
+            super().available and self._description.key in self.coordinator.data["data"]
+        )
+
     @property
     def state(self) -> StateType:
         """Return sensor state."""