Prevent AirVisual from polling (#36199)

* Prevent AirVisual from polling

* Docstring

homeassistant/components/airvisual/__init__.py

@@ -375,6 +375,11 @@ class AirVisualEntity(Entity):
         """Return the icon."""
         return self._icon
 
+    @property
+    def should_poll(self) -> bool:
+        """Disable polling."""
+        return False
+
     @property
     def unit_of_measurement(self):
         """Return the unit the value is expressed in."""