diff --git a/homeassistant/components/airq/diagnostics.py b/homeassistant/components/airq/diagnostics.py
new file mode 100644
index 00000000000..17299991355
--- /dev/null
+++ b/homeassistant/components/airq/diagnostics.py
@@ -0,0 +1,36 @@
+"""Diagnostics support for air-Q."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.const import CONF_IP_ADDRESS, CONF_PASSWORD, CONF_UNIQUE_ID
+from homeassistant.core import HomeAssistant
+
+from . import AirQConfigEntry
+
+REDACT_CONFIG = {CONF_PASSWORD, CONF_UNIQUE_ID, CONF_IP_ADDRESS, "title"}
+REDACT_DEVICE_INFO = {"identifiers", "name"}
+REDACT_COORDINATOR_DATA = {"DeviceID"}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: AirQConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    coordinator = entry.runtime_data
+
+    return {
+        "config_entry": async_redact_data(entry.as_dict(), REDACT_CONFIG),
+        "device_info": async_redact_data(
+            dict(coordinator.device_info), REDACT_DEVICE_INFO
+        ),
+        "coordinator_data": async_redact_data(
+            coordinator.data, REDACT_COORDINATOR_DATA
+        ),
+        "options": {
+            "clip_negative": coordinator.clip_negative,
+            "return_average": coordinator.return_average,
+        },
+    }
diff --git a/tests/components/airq/snapshots/test_diagnostics.ambr b/tests/components/airq/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..7b0a351304d
--- /dev/null
+++ b/tests/components/airq/snapshots/test_diagnostics.ambr
@@ -0,0 +1,46 @@
+# serializer version: 1
+# name: test_entry_diagnostics
+  dict({
+    'config_entry': dict({
+      'created_at': '2025-01-01T00:00:00+00:00',
+      'data': dict({
+        'ip_address': '**REDACTED**',
+        'password': '**REDACTED**',
+      }),
+      'disabled_by': None,
+      'discovery_keys': dict({
+      }),
+      'domain': 'airq',
+      'entry_id': '01JGFJJZ008DNE3BKJ7ZE14YFE',
+      'minor_version': 1,
+      'modified_at': '2025-01-01T00:00:00+00:00',
+      'options': dict({
+      }),
+      'pref_disable_new_entities': False,
+      'pref_disable_polling': False,
+      'source': 'user',
+      'subentries': list([
+      ]),
+      'title': '**REDACTED**',
+      'unique_id': '**REDACTED**',
+      'version': 1,
+    }),
+    'coordinator_data': dict({
+      'Status': 'OK',
+      'brightness': 42,
+      'co2': 500.0,
+    }),
+    'device_info': dict({
+      'hw_version': 'hw',
+      'identifiers': '**REDACTED**',
+      'manufacturer': 'CorantGmbH',
+      'model': 'model',
+      'name': '**REDACTED**',
+      'sw_version': 'sw',
+    }),
+    'options': dict({
+      'clip_negative': True,
+      'return_average': True,
+    }),
+  })
+# ---
diff --git a/tests/components/airq/test_diagnostics.py b/tests/components/airq/test_diagnostics.py
new file mode 100644
index 00000000000..b60a9b52ad5
--- /dev/null
+++ b/tests/components/airq/test_diagnostics.py
@@ -0,0 +1,38 @@
+"""Test air-Q diagnostics."""
+
+import pytest
+from syrupy.assertion import SnapshotAssertion
+
+from homeassistant.components.airq.const import DOMAIN
+from homeassistant.core import HomeAssistant
+
+from .common import TEST_DEVICE_INFO, TEST_USER_DATA
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.typing import ClientSessionGenerator
+
+FIXED_MOCK_ENTRY_ID = "01JGFJJZ008DNE3BKJ7ZE14YFE"
+
+
+@pytest.mark.freeze_time("2025-01-01T00:00:00+00:00")
+async def test_entry_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    mock_airq,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test config entry diagnostics."""
+    config_entry = MockConfigEntry(
+        domain=DOMAIN,
+        data=TEST_USER_DATA,
+        unique_id=TEST_DEVICE_INFO["id"],
+        entry_id=FIXED_MOCK_ENTRY_ID,
+    )
+    config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    result = await get_diagnostics_for_config_entry(hass, hass_client, config_entry)
+
+    assert result == snapshot