diff --git a/homeassistant/components/airnow/config_flow.py b/homeassistant/components/airnow/config_flow.py
index 661e1b0a298..331fdb729f5 100644
--- a/homeassistant/components/airnow/config_flow.py
+++ b/homeassistant/components/airnow/config_flow.py
@@ -26,6 +26,10 @@ from .const import DOMAIN
 _LOGGER = logging.getLogger(__name__)
 
 
+# Documentation URL for API key generation
+_API_KEY_URL = "https://docs.airnowapi.org/account/request/"
+
+
 async def validate_input(hass: HomeAssistant, data: dict[str, Any]) -> bool:
     """Validate the user input allows us to connect.
 
@@ -114,6 +118,7 @@ class AirNowConfigFlow(ConfigFlow, domain=DOMAIN):
                     ),
                 }
             ),
+            description_placeholders={"api_key_url": _API_KEY_URL},
             errors=errors,
         )
 
diff --git a/homeassistant/components/airnow/strings.json b/homeassistant/components/airnow/strings.json
index a69f67948cb..f6ccf858314 100644
--- a/homeassistant/components/airnow/strings.json
+++ b/homeassistant/components/airnow/strings.json
@@ -2,7 +2,7 @@
   "config": {
     "step": {
       "user": {
-        "description": "To generate API key go to https://docs.airnowapi.org/account/request/",
+        "description": "To generate API key go to {api_key_url}",
         "data": {
           "api_key": "[%key:common::config_flow::data::api_key%]",
           "latitude": "[%key:common::config_flow::data::latitude%]",
diff --git a/tests/components/airnow/test_config_flow.py b/tests/components/airnow/test_config_flow.py
index 6507eea1fcb..759a21bc559 100644
--- a/tests/components/airnow/test_config_flow.py
+++ b/tests/components/airnow/test_config_flow.py
@@ -25,6 +25,9 @@ async def test_form(
     )
     assert result["type"] is FlowResultType.FORM
     assert result["errors"] == {}
+    assert result["description_placeholders"] == {
+        "api_key_url": "https://docs.airnowapi.org/account/request/"
+    }
 
     result2 = await hass.config_entries.flow.async_configure(result["flow_id"], config)
     assert result2["type"] is FlowResultType.CREATE_ENTRY