diff --git a/homeassistant/components/co2signal/icons.json b/homeassistant/components/co2signal/icons.json
new file mode 100644
index 000000000000..e934fc49e414
--- /dev/null
+++ b/homeassistant/components/co2signal/icons.json
@@ -0,0 +1,12 @@
+{
+  "entity": {
+    "sensor": {
+      "carbon_intensity": {
+        "default": "mdi:molecule-co2"
+      },
+      "fossil_fuel_percentage": {
+        "default": "mdi:molecule-co2"
+      }
+    }
+  }
+}
diff --git a/homeassistant/components/co2signal/sensor.py b/homeassistant/components/co2signal/sensor.py
index 9f955e35ed80..bff17becedef 100644
--- a/homeassistant/components/co2signal/sensor.py
+++ b/homeassistant/components/co2signal/sensor.py
@@ -67,7 +67,6 @@ class CO2Sensor(CoordinatorEntity[CO2SignalCoordinator], SensorEntity):
     entity_description: CO2SensorEntityDescription
     _attr_attribution = ATTRIBUTION
     _attr_has_entity_name = True
-    _attr_icon = "mdi:molecule-co2"
     _attr_state_class = SensorStateClass.MEASUREMENT
 
     def __init__(
diff --git a/tests/components/co2signal/snapshots/test_sensor.ambr b/tests/components/co2signal/snapshots/test_sensor.ambr
index eb4364ed0d64..d671640e316e 100644
--- a/tests/components/co2signal/snapshots/test_sensor.ambr
+++ b/tests/components/co2signal/snapshots/test_sensor.ambr
@@ -22,7 +22,7 @@
     'options': dict({
     }),
     'original_device_class': None,
-    'original_icon': 'mdi:molecule-co2',
+    'original_icon': None,
     'original_name': 'CO2 intensity',
     'platform': 'co2signal',
     'previous_unique_id': None,
@@ -38,7 +38,6 @@
       'attribution': 'Data provided by Electricity Maps',
       'country_code': 'FR',
       'friendly_name': 'Electricity Maps CO2 intensity',
-      'icon': 'mdi:molecule-co2',
       'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
       'unit_of_measurement': 'gCO2eq/kWh',
     }),
@@ -72,7 +71,7 @@
     'options': dict({
     }),
     'original_device_class': None,
-    'original_icon': 'mdi:molecule-co2',
+    'original_icon': None,
     'original_name': 'Grid fossil fuel percentage',
     'platform': 'co2signal',
     'previous_unique_id': None,
@@ -88,7 +87,6 @@
       'attribution': 'Data provided by Electricity Maps',
       'country_code': 'FR',
       'friendly_name': 'Electricity Maps Grid fossil fuel percentage',
-      'icon': 'mdi:molecule-co2',
       'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
       'unit_of_measurement': '%',
     }),