diff --git a/homeassistant/components/airgradient/select.py b/homeassistant/components/airgradient/select.py
index c37df0483d1..a64ce596806 100644
--- a/homeassistant/components/airgradient/select.py
+++ b/homeassistant/components/airgradient/select.py
@@ -79,62 +79,59 @@ LED_BAR_ENTITIES: tuple[AirGradientSelectEntityDescription, ...] = (
     ),
 )
 
-LEARNING_TIME_OFFSET_OPTIONS = {
-    12: "12",
-    60: "60",
-    120: "120",
-    360: "360",
-    720: "720",
-}
-LEARNING_TIME_OFFSET_OPTIONS_INVERSE = {
-    v: k for k, v in LEARNING_TIME_OFFSET_OPTIONS.items()
-}
-ABC_DAYS = {
-    8: "8",
-    30: "30",
-    90: "90",
-    180: "180",
-    0: "off",
-}
-ABC_DAYS_INVERSE = {v: k for k, v in ABC_DAYS.items()}
+LEARNING_TIME_OFFSET_OPTIONS = [
+    "12",
+    "60",
+    "120",
+    "360",
+    "720",
+]
+
+ABC_DAYS = [
+    "8",
+    "30",
+    "90",
+    "180",
+    "0",
+]
+
+
+def _get_value(value: int, values: list[str]) -> str | None:
+    str_value = str(value)
+    return str_value if str_value in values else None
+
 
 CONTROL_ENTITIES: tuple[AirGradientSelectEntityDescription, ...] = (
     AirGradientSelectEntityDescription(
         key="nox_index_learning_time_offset",
         translation_key="nox_index_learning_time_offset",
-        options=list(LEARNING_TIME_OFFSET_OPTIONS_INVERSE),
+        options=LEARNING_TIME_OFFSET_OPTIONS,
         entity_category=EntityCategory.CONFIG,
-        value_fn=lambda config: LEARNING_TIME_OFFSET_OPTIONS.get(
-            config.nox_learning_offset
-        ),
-        set_value_fn=lambda client, value: client.set_nox_learning_offset(
-            LEARNING_TIME_OFFSET_OPTIONS_INVERSE.get(value, 12)
+        value_fn=lambda config: _get_value(
+            config.nox_learning_offset, LEARNING_TIME_OFFSET_OPTIONS
         ),
+        set_value_fn=lambda client, value: client.set_nox_learning_offset(int(value)),
     ),
     AirGradientSelectEntityDescription(
         key="voc_index_learning_time_offset",
         translation_key="voc_index_learning_time_offset",
-        options=list(LEARNING_TIME_OFFSET_OPTIONS_INVERSE),
+        options=LEARNING_TIME_OFFSET_OPTIONS,
         entity_category=EntityCategory.CONFIG,
-        value_fn=lambda config: LEARNING_TIME_OFFSET_OPTIONS.get(
-            config.nox_learning_offset
-        ),
-        set_value_fn=lambda client, value: client.set_tvoc_learning_offset(
-            LEARNING_TIME_OFFSET_OPTIONS_INVERSE.get(value, 12)
+        value_fn=lambda config: _get_value(
+            config.tvoc_learning_offset, LEARNING_TIME_OFFSET_OPTIONS
         ),
+        set_value_fn=lambda client, value: client.set_tvoc_learning_offset(int(value)),
     ),
     AirGradientSelectEntityDescription(
         key="co2_automatic_baseline_calibration",
         translation_key="co2_automatic_baseline_calibration",
-        options=list(ABC_DAYS_INVERSE),
+        options=ABC_DAYS,
         entity_category=EntityCategory.CONFIG,
-        value_fn=lambda config: ABC_DAYS.get(
-            config.co2_automatic_baseline_calibration_days
+        value_fn=lambda config: _get_value(
+            config.co2_automatic_baseline_calibration_days, ABC_DAYS
         ),
         set_value_fn=lambda client,
-        value: client.set_co2_automatic_baseline_calibration(
-            ABC_DAYS_INVERSE.get(value, 0)
-        ),
+        value: client.set_co2_automatic_baseline_calibration(int(value)),
     ),
 )
 
diff --git a/tests/components/airgradient/snapshots/test_select.ambr b/tests/components/airgradient/snapshots/test_select.ambr
index 19cdc2134fc..ece563b40c6 100644
--- a/tests/components/airgradient/snapshots/test_select.ambr
+++ b/tests/components/airgradient/snapshots/test_select.ambr
@@ -10,7 +10,7 @@
         '30',
         '90',
         '180',
-        'off',
+        '0',
       ]),
     }),
     'config_entry_id': <ANY>,
@@ -49,7 +49,7 @@
         '30',
         '90',
         '180',
-        'off',
+        '0',
       ]),
     }),
     'context': <ANY>,
@@ -415,7 +415,7 @@
         '30',
         '90',
         '180',
-        'off',
+        '0',
       ]),
     }),
     'config_entry_id': <ANY>,
@@ -454,7 +454,7 @@
         '30',
         '90',
         '180',
-        'off',
+        '0',
       ]),
     }),
     'context': <ANY>,