diff --git a/homeassistant/components/gios/__init__.py b/homeassistant/components/gios/__init__.py
index 31f704fcacc..e19b1d280d2 100644
--- a/homeassistant/components/gios/__init__.py
+++ b/homeassistant/components/gios/__init__.py
@@ -8,15 +8,14 @@ from aiohttp.client_exceptions import ClientConnectorError
 from gios import Gios
 from gios.exceptions import GiosError
 
-from homeassistant.components.air_quality import DOMAIN as AIR_QUALITY_PLATFORM
 from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import ConfigEntryNotReady
-from homeassistant.helpers import device_registry as dr, entity_registry as er
+from homeassistant.helpers import device_registry as dr
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
 
 from .const import CONF_STATION_ID, DOMAIN
-from .coordinator import GiosConfigEntry, GiosData, GiosDataUpdateCoordinator
+from .coordinator import GiosConfigEntry, GiosDataUpdateCoordinator
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -56,19 +55,10 @@ async def async_setup_entry(hass: HomeAssistant, entry: GiosConfigEntry) -> bool
     coordinator = GiosDataUpdateCoordinator(hass, entry, gios)
     await coordinator.async_config_entry_first_refresh()
 
-    entry.runtime_data = GiosData(coordinator)
+    entry.runtime_data = coordinator
 
     await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
 
-    # Remove air_quality entities from registry if they exist
-    ent_reg = er.async_get(hass)
-    unique_id = str(coordinator.gios.station_id)
-    if entity_id := ent_reg.async_get_entity_id(
-        AIR_QUALITY_PLATFORM, DOMAIN, unique_id
-    ):
-        _LOGGER.debug("Removing deprecated air_quality entity %s", entity_id)
-        ent_reg.async_remove(entity_id)
-
     return True
 
 
diff --git a/homeassistant/components/gios/config_flow.py b/homeassistant/components/gios/config_flow.py
index 5745d15e72e..eb83e92bc03 100644
--- a/homeassistant/components/gios/config_flow.py
+++ b/homeassistant/components/gios/config_flow.py
@@ -38,14 +38,18 @@ class GiosFlowHandler(ConfigFlow, domain=DOMAIN):
         if user_input is not None:
             station_id = user_input[CONF_STATION_ID]
 
-            try:
-                await self.async_set_unique_id(station_id, raise_on_progress=False)
-                self._abort_if_unique_id_configured()
+            await self.async_set_unique_id(station_id, raise_on_progress=False)
+            self._abort_if_unique_id_configured()
 
+            try:
                 async with asyncio.timeout(API_TIMEOUT):
                     gios = await Gios.create(websession, int(station_id))
                     await gios.async_update()
-
+            except ApiError, ClientConnectorError, TimeoutError:
+                errors["base"] = "cannot_connect"
+            except InvalidSensorsDataError:
+                errors[CONF_STATION_ID] = "invalid_sensors_data"
+            else:
                 # GIOS treats station ID as int
                 user_input[CONF_STATION_ID] = int(station_id)
 
@@ -60,10 +64,6 @@ class GiosFlowHandler(ConfigFlow, domain=DOMAIN):
                     # raising errors.
                     data={**user_input, CONF_NAME: gios.station_name},
                 )
-            except ApiError, ClientConnectorError, TimeoutError:
-                errors["base"] = "cannot_connect"
-            except InvalidSensorsDataError:
-                errors[CONF_STATION_ID] = "invalid_sensors_data"
 
         try:
             gios = await Gios.create(websession)
diff --git a/homeassistant/components/gios/coordinator.py b/homeassistant/components/gios/coordinator.py
index c80557da55f..60525b33edf 100644
--- a/homeassistant/components/gios/coordinator.py
+++ b/homeassistant/components/gios/coordinator.py
@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import asyncio
-from dataclasses import dataclass
 import logging
 from typing import TYPE_CHECKING
 
@@ -22,14 +21,7 @@ from .const import API_TIMEOUT, DOMAIN, MANUFACTURER, SCAN_INTERVAL, URL
 
 _LOGGER = logging.getLogger(__name__)
 
-type GiosConfigEntry = ConfigEntry[GiosData]
-
-
-@dataclass
-class GiosData:
-    """Data for GIOS integration."""
-
-    coordinator: GiosDataUpdateCoordinator
+type GiosConfigEntry = ConfigEntry[GiosDataUpdateCoordinator]
 
 
 class GiosDataUpdateCoordinator(DataUpdateCoordinator[GiosSensors]):
diff --git a/homeassistant/components/gios/diagnostics.py b/homeassistant/components/gios/diagnostics.py
index 7e938d5ac6b..e25f56dcbc7 100644
--- a/homeassistant/components/gios/diagnostics.py
+++ b/homeassistant/components/gios/diagnostics.py
@@ -14,7 +14,7 @@ async def async_get_config_entry_diagnostics(
     hass: HomeAssistant, config_entry: GiosConfigEntry
 ) -> dict[str, Any]:
     """Return diagnostics for a config entry."""
-    coordinator = config_entry.runtime_data.coordinator
+    coordinator = config_entry.runtime_data
 
     return {
         "config_entry": config_entry.as_dict(),
diff --git a/homeassistant/components/gios/manifest.json b/homeassistant/components/gios/manifest.json
index 5cdd0d513a3..e92e14ae555 100644
--- a/homeassistant/components/gios/manifest.json
+++ b/homeassistant/components/gios/manifest.json
@@ -7,5 +7,6 @@
   "integration_type": "service",
   "iot_class": "cloud_polling",
   "loggers": ["dacite", "gios"],
+  "quality_scale": "platinum",
   "requirements": ["gios==7.0.0"]
 }
diff --git a/homeassistant/components/gios/quality_scale.yaml b/homeassistant/components/gios/quality_scale.yaml
index cab565d35cf..f1b25b15b55 100644
--- a/homeassistant/components/gios/quality_scale.yaml
+++ b/homeassistant/components/gios/quality_scale.yaml
@@ -1,7 +1,4 @@
 rules:
-  # Other comments:
-  # - we could consider removing the air quality entity removal
-
   # Bronze
   action-setup:
     status: exempt
@@ -9,14 +6,8 @@ rules:
   appropriate-polling: done
   brands: done
   common-modules: done
-  config-flow-test-coverage:
-    status: todo
-    comment:
-      We should have the happy flow as the first test, which can be merged with test_show_form.
-      The config flow tests are missing adding a duplicate entry test.
-  config-flow:
-    status: todo
-    comment: Limit the scope of the try block in the user step
+  config-flow-test-coverage: done
+  config-flow: done
   dependency-transparency: done
   docs-actions:
     status: exempt
@@ -27,9 +18,7 @@ rules:
   entity-event-setup: done
   entity-unique-id: done
   has-entity-name: done
-  runtime-data:
-    status: todo
-    comment: No direct need to wrap the coordinator in a dataclass to store in the config entry
+  runtime-data: done
   test-before-configure: done
   test-before-setup: done
   unique-config-entry: done
@@ -50,11 +39,7 @@ rules:
   reauthentication-flow:
     status: exempt
     comment: This integration does not require authentication.
-  test-coverage:
-    status: todo
-    comment:
-      The `test_async_setup_entry` should test the state of the mock config entry, instead of an entity state
-      The `test_availability` doesn't really do what it says it does, and this is now already tested via the snapshot tests.
+  test-coverage: done
 
   # Gold
   devices: done
@@ -78,13 +63,9 @@ rules:
     status: exempt
     comment: This integration does not have devices.
   entity-category: done
-  entity-device-class:
-    status: todo
-    comment: We can use the CO device class for the carbon monoxide sensor
+  entity-device-class: done
   entity-disabled-by-default: done
-  entity-translations:
-    status: todo
-    comment: We can remove the options state_attributes.
+  entity-translations: done
   exception-translations: done
   icon-translations: done
   reconfiguration-flow:
diff --git a/homeassistant/components/gios/sensor.py b/homeassistant/components/gios/sensor.py
index 7fb6fcf431c..b51526ebcaf 100644
--- a/homeassistant/components/gios/sensor.py
+++ b/homeassistant/components/gios/sensor.py
@@ -72,9 +72,9 @@ SENSOR_TYPES: tuple[GiosSensorEntityDescription, ...] = (
         key=ATTR_CO,
         value=lambda sensors: sensors.co.value if sensors.co else None,
         suggested_display_precision=0,
+        device_class=SensorDeviceClass.CO,
         native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
         state_class=SensorStateClass.MEASUREMENT,
-        translation_key="co",
     ),
     GiosSensorEntityDescription(
         key=ATTR_NO,
@@ -181,7 +181,7 @@ async def async_setup_entry(
     async_add_entities: AddConfigEntryEntitiesCallback,
 ) -> None:
     """Add a GIOS entities from a config_entry."""
-    coordinator = entry.runtime_data.coordinator
+    coordinator = entry.runtime_data
     # Due to the change of the attribute name of one sensor, it is necessary to migrate
     # the unique_id to the new name.
     entity_registry = er.async_get(hass)
diff --git a/homeassistant/components/gios/strings.json b/homeassistant/components/gios/strings.json
index da9c246600a..09d9a1dfc7b 100644
--- a/homeassistant/components/gios/strings.json
+++ b/homeassistant/components/gios/strings.json
@@ -31,26 +31,11 @@
           "sufficient": "Sufficient",
           "very_bad": "Very bad",
           "very_good": "Very good"
-        },
-        "state_attributes": {
-          "options": {
-            "state": {
-              "bad": "[%key:component::gios::entity::sensor::aqi::state::bad%]",
-              "good": "[%key:component::gios::entity::sensor::aqi::state::good%]",
-              "moderate": "[%key:component::gios::entity::sensor::aqi::state::moderate%]",
-              "sufficient": "[%key:component::gios::entity::sensor::aqi::state::sufficient%]",
-              "very_bad": "[%key:component::gios::entity::sensor::aqi::state::very_bad%]",
-              "very_good": "[%key:component::gios::entity::sensor::aqi::state::very_good%]"
-            }
-          }
         }
       },
       "c6h6": {
         "name": "Benzene"
       },
-      "co": {
-        "name": "[%key:component::sensor::entity_component::carbon_monoxide::name%]"
-      },
       "no2_index": {
         "name": "Nitrogen dioxide index",
         "state": {
@@ -60,18 +45,6 @@
           "sufficient": "[%key:component::gios::entity::sensor::aqi::state::sufficient%]",
           "very_bad": "[%key:component::gios::entity::sensor::aqi::state::very_bad%]",
           "very_good": "[%key:component::gios::entity::sensor::aqi::state::very_good%]"
-        },
-        "state_attributes": {
-          "options": {
-            "state": {
-              "bad": "[%key:component::gios::entity::sensor::aqi::state::bad%]",
-              "good": "[%key:component::gios::entity::sensor::aqi::state::good%]",
-              "moderate": "[%key:component::gios::entity::sensor::aqi::state::moderate%]",
-              "sufficient": "[%key:component::gios::entity::sensor::aqi::state::sufficient%]",
-              "very_bad": "[%key:component::gios::entity::sensor::aqi::state::very_bad%]",
-              "very_good": "[%key:component::gios::entity::sensor::aqi::state::very_good%]"
-            }
-          }
         }
       },
       "nox": {
@@ -86,18 +59,6 @@
           "sufficient": "[%key:component::gios::entity::sensor::aqi::state::sufficient%]",
           "very_bad": "[%key:component::gios::entity::sensor::aqi::state::very_bad%]",
           "very_good": "[%key:component::gios::entity::sensor::aqi::state::very_good%]"
-        },
-        "state_attributes": {
-          "options": {
-            "state": {
-              "bad": "[%key:component::gios::entity::sensor::aqi::state::bad%]",
-              "good": "[%key:component::gios::entity::sensor::aqi::state::good%]",
-              "moderate": "[%key:component::gios::entity::sensor::aqi::state::moderate%]",
-              "sufficient": "[%key:component::gios::entity::sensor::aqi::state::sufficient%]",
-              "very_bad": "[%key:component::gios::entity::sensor::aqi::state::very_bad%]",
-              "very_good": "[%key:component::gios::entity::sensor::aqi::state::very_good%]"
-            }
-          }
         }
       },
       "pm10_index": {
@@ -109,18 +70,6 @@
           "sufficient": "[%key:component::gios::entity::sensor::aqi::state::sufficient%]",
           "very_bad": "[%key:component::gios::entity::sensor::aqi::state::very_bad%]",
           "very_good": "[%key:component::gios::entity::sensor::aqi::state::very_good%]"
-        },
-        "state_attributes": {
-          "options": {
-            "state": {
-              "bad": "[%key:component::gios::entity::sensor::aqi::state::bad%]",
-              "good": "[%key:component::gios::entity::sensor::aqi::state::good%]",
-              "moderate": "[%key:component::gios::entity::sensor::aqi::state::moderate%]",
-              "sufficient": "[%key:component::gios::entity::sensor::aqi::state::sufficient%]",
-              "very_bad": "[%key:component::gios::entity::sensor::aqi::state::very_bad%]",
-              "very_good": "[%key:component::gios::entity::sensor::aqi::state::very_good%]"
-            }
-          }
         }
       },
       "pm25_index": {
@@ -132,18 +81,6 @@
           "sufficient": "[%key:component::gios::entity::sensor::aqi::state::sufficient%]",
           "very_bad": "[%key:component::gios::entity::sensor::aqi::state::very_bad%]",
           "very_good": "[%key:component::gios::entity::sensor::aqi::state::very_good%]"
-        },
-        "state_attributes": {
-          "options": {
-            "state": {
-              "bad": "[%key:component::gios::entity::sensor::aqi::state::bad%]",
-              "good": "[%key:component::gios::entity::sensor::aqi::state::good%]",
-              "moderate": "[%key:component::gios::entity::sensor::aqi::state::moderate%]",
-              "sufficient": "[%key:component::gios::entity::sensor::aqi::state::sufficient%]",
-              "very_bad": "[%key:component::gios::entity::sensor::aqi::state::very_bad%]",
-              "very_good": "[%key:component::gios::entity::sensor::aqi::state::very_good%]"
-            }
-          }
         }
       },
       "so2_index": {
@@ -155,18 +92,6 @@
           "sufficient": "[%key:component::gios::entity::sensor::aqi::state::sufficient%]",
           "very_bad": "[%key:component::gios::entity::sensor::aqi::state::very_bad%]",
           "very_good": "[%key:component::gios::entity::sensor::aqi::state::very_good%]"
-        },
-        "state_attributes": {
-          "options": {
-            "state": {
-              "bad": "[%key:component::gios::entity::sensor::aqi::state::bad%]",
-              "good": "[%key:component::gios::entity::sensor::aqi::state::good%]",
-              "moderate": "[%key:component::gios::entity::sensor::aqi::state::moderate%]",
-              "sufficient": "[%key:component::gios::entity::sensor::aqi::state::sufficient%]",
-              "very_bad": "[%key:component::gios::entity::sensor::aqi::state::very_bad%]",
-              "very_good": "[%key:component::gios::entity::sensor::aqi::state::very_good%]"
-            }
-          }
         }
       }
     }
diff --git a/script/hassfest/quality_scale.py b/script/hassfest/quality_scale.py
index e7b0cafd091..4a17f8babfb 100644
--- a/script/hassfest/quality_scale.py
+++ b/script/hassfest/quality_scale.py
@@ -1403,7 +1403,6 @@ INTEGRATIONS_WITHOUT_SCALE = [
     "geofency",
     "geonetnz_quakes",
     "geonetnz_volcano",
-    "gios",
     "github",
     "gitlab_ci",
     "gitter",
diff --git a/tests/components/gios/snapshots/test_sensor.ambr b/tests/components/gios/snapshots/test_sensor.ambr
index e5125b140d7..8ef0f86216a 100644
--- a/tests/components/gios/snapshots/test_sensor.ambr
+++ b/tests/components/gios/snapshots/test_sensor.ambr
@@ -153,14 +153,14 @@
         'suggested_display_precision': 0,
       }),
     }),
-    'original_device_class': None,
+    'original_device_class': <SensorDeviceClass.CO: 'carbon_monoxide'>,
     'original_icon': None,
     'original_name': 'Carbon monoxide',
     'platform': 'gios',
     'previous_unique_id': None,
     'suggested_object_id': None,
     'supported_features': 0,
-    'translation_key': 'co',
+    'translation_key': None,
     'unique_id': '123-co',
     'unit_of_measurement': 'μg/m³',
   })
@@ -169,6 +169,7 @@
   StateSnapshot({
     'attributes': ReadOnlyDict({
       'attribution': 'Data provided by GIOŚ',
+      'device_class': 'carbon_monoxide',
       'friendly_name': 'Home Carbon monoxide',
       'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
       'unit_of_measurement': 'μg/m³',
diff --git a/tests/components/gios/test_config_flow.py b/tests/components/gios/test_config_flow.py
index b7229c621be..b0b676fdfc3 100644
--- a/tests/components/gios/test_config_flow.py
+++ b/tests/components/gios/test_config_flow.py
@@ -11,6 +11,8 @@ from homeassistant.const import CONF_NAME
 from homeassistant.core import HomeAssistant
 from homeassistant.data_entry_flow import FlowResultType
 
+from tests.common import MockConfigEntry
+
 CONFIG = {
     CONF_STATION_ID: "123",
 }
@@ -18,8 +20,8 @@ CONFIG = {
 pytestmark = pytest.mark.usefixtures("mock_gios")
 
 
-async def test_show_form(hass: HomeAssistant) -> None:
-    """Test that the form is served with no input."""
+async def test_happy_flow(hass: HomeAssistant) -> None:
+    """Test that the user step works."""
     result = await hass.config_entries.flow.async_init(
         DOMAIN, context={"source": SOURCE_USER}
     )
@@ -28,6 +30,19 @@ async def test_show_form(hass: HomeAssistant) -> None:
     assert result["step_id"] == "user"
     assert len(result["data_schema"].schema[CONF_STATION_ID].config["options"]) == 2
 
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"], user_input=CONFIG
+    )
+
+    assert result["type"] is FlowResultType.CREATE_ENTRY
+    assert result["title"] == "Home"
+    assert result["data"] == {
+        CONF_STATION_ID: 123,
+        CONF_NAME: "Home",
+    }
+
+    assert result["result"].unique_id == "123"
+
 
 async def test_form_with_api_error(hass: HomeAssistant, mock_gios: MagicMock) -> None:
     """Test the form is aborted because of API error."""
@@ -76,21 +91,19 @@ async def test_form_submission_errors(
     assert result["title"] == "Home"
 
 
-async def test_create_entry(hass: HomeAssistant) -> None:
-    """Test that the user step works."""
+async def test_duplicate_entry(
+    hass: HomeAssistant, mock_config_entry: MockConfigEntry
+) -> None:
+    """Test that duplicate station IDs are rejected."""
+    mock_config_entry.add_to_hass(hass)
+
     result = await hass.config_entries.flow.async_init(
-        DOMAIN,
-        context={"source": SOURCE_USER},
+        DOMAIN, context={"source": SOURCE_USER}
     )
+
     result = await hass.config_entries.flow.async_configure(
         result["flow_id"], user_input=CONFIG
     )
 
-    assert result["type"] is FlowResultType.CREATE_ENTRY
-    assert result["title"] == "Home"
-    assert result["data"] == {
-        CONF_STATION_ID: 123,
-        CONF_NAME: "Home",
-    }
-
-    assert result["result"].unique_id == "123"
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "already_configured"
diff --git a/tests/components/gios/test_init.py b/tests/components/gios/test_init.py
index 20944ea4427..97e1f2f6462 100644
--- a/tests/components/gios/test_init.py
+++ b/tests/components/gios/test_init.py
@@ -4,12 +4,10 @@ from unittest.mock import MagicMock
 
 import pytest
 
-from homeassistant.components.air_quality import DOMAIN as AIR_QUALITY_PLATFORM
 from homeassistant.components.gios.const import DOMAIN
 from homeassistant.config_entries import ConfigEntryState
-from homeassistant.const import STATE_UNAVAILABLE
 from homeassistant.core import HomeAssistant
-from homeassistant.helpers import device_registry as dr, entity_registry as er
+from homeassistant.helpers import device_registry as dr
 
 from . import setup_integration
 
@@ -19,12 +17,10 @@ from tests.common import MockConfigEntry
 @pytest.mark.usefixtures("init_integration")
 async def test_async_setup_entry(
     hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
 ) -> None:
     """Test a successful setup entry."""
-    state = hass.states.get("sensor.home_pm2_5")
-    assert state is not None
-    assert state.state != STATE_UNAVAILABLE
-    assert state.state == "4"
+    assert mock_config_entry.state is ConfigEntryState.LOADED
 
 
 async def test_config_not_ready(
@@ -93,26 +89,3 @@ async def test_migrate_unique_id_to_str(
     await setup_integration(hass, mock_config_entry)
 
     assert mock_config_entry.unique_id == "123"
-
-
-async def test_remove_air_quality_entities(
-    hass: HomeAssistant,
-    entity_registry: er.EntityRegistry,
-    mock_config_entry: MockConfigEntry,
-    mock_gios: MagicMock,
-) -> None:
-    """Test remove air_quality entities from registry."""
-    mock_config_entry.add_to_hass(hass)
-    entity_registry.async_get_or_create(
-        AIR_QUALITY_PLATFORM,
-        DOMAIN,
-        "123",
-        suggested_object_id="home",
-        disabled_by=None,
-    )
-
-    await hass.config_entries.async_setup(mock_config_entry.entry_id)
-    await hass.async_block_till_done()
-
-    entry = entity_registry.async_get("air_quality.home")
-    assert entry is None
diff --git a/tests/components/gios/test_sensor.py b/tests/components/gios/test_sensor.py
index b668de99a4e..37cd27b78b6 100644
--- a/tests/components/gios/test_sensor.py
+++ b/tests/components/gios/test_sensor.py
@@ -37,22 +37,6 @@ async def test_sensor(
     await snapshot_platform(hass, entity_registry, snapshot, mock_config_entry.entry_id)
 
 
-@pytest.mark.usefixtures("init_integration")
-async def test_availability(hass: HomeAssistant) -> None:
-    """Ensure that we mark the entities unavailable correctly when service causes an error."""
-    state = hass.states.get("sensor.home_pm2_5")
-    assert state
-    assert state.state == "4"
-
-    state = hass.states.get("sensor.home_pm2_5_index")
-    assert state
-    assert state.state == "good"
-
-    state = hass.states.get("sensor.home_air_quality_index")
-    assert state
-    assert state.state == "good"
-
-
 @pytest.mark.usefixtures("init_integration")
 async def test_availability_api_error(
     hass: HomeAssistant,