diff --git a/src/Model/Pollutants/Pollutants.py b/src/Model/Pollutants/Pollutants.py
index 1026851f..cb8f345c 100644
--- a/src/Model/Pollutants/Pollutants.py
+++ b/src/Model/Pollutants/Pollutants.py
@@ -104,6 +104,12 @@ class PollutantCharacteristics(SQLSubModel):
             self._ac = value
         elif key == 8:
             self._bc = value
+        self.propagate_modified()
+
+    def propagate_modified(self):
+        self.modified()
+        if hasattr(self, "_pollutant") and self._pollutant:
+            self._pollutant.modified()
 
     @classmethod
     def _db_create(cls, execute, ext=""):
@@ -256,6 +262,12 @@ class PollutantCharacteristics(SQLSubModel):
         if not self.must_be_saved():
             return True
 
+        execute(
+                "DELETE FROM pollutants_characteristics " +
+                f"WHERE pamhyr_id = {self.id} " +
+                f"AND scenario = {self._status.scenario_id}"
+            )
+
         execute(
             "INSERT INTO " +
             "pollutants_characteristics(pamhyr_id, deleted, " +
@@ -312,7 +324,7 @@ class Pollutants(SQLSubModel):
     @name.setter
     def name(self, name):
         self._name = name
-        self._status.modified()
+        self.modified()
 
     @property
     def data(self):
diff --git a/src/Model/Pollutants/PollutantsList.py b/src/Model/Pollutants/PollutantsList.py
index c32b8446..3970ba7e 100644
--- a/src/Model/Pollutants/PollutantsList.py
+++ b/src/Model/Pollutants/PollutantsList.py
@@ -19,7 +19,7 @@
 from tools import trace, timer
 
 from Model.Except import NotImplementedMethodeError
-from Model.Tools.PamhyrList import PamhyrModelList
+from Model.Tools.PamhyrListExt import PamhyrModelList
 from Model.Pollutants.Pollutants import Pollutants