diff --git a/scripts/gui/microbe_hud.mjs b/scripts/gui/microbe_hud.mjs
index fff717c06f8..3e159265140 100644
--- a/scripts/gui/microbe_hud.mjs
+++ b/scripts/gui/microbe_hud.mjs
@@ -68,6 +68,11 @@ export function runMicrobeHUDSetup(){
             checkExtinction(vars.population);
         });
 
+        // Event for updating o2 and c02 numbers
+        Leviathan.OnGeneric("UpdateDissolvedGasses", (event, vars) => {
+            updateDissolvedGasses(vars.oxygenPercent, vars.co2Percent);
+        });
+
         // Event for checking win conditions
         Leviathan.OnGeneric("CheckWin", (event, vars) => {
             checkGeneration(vars.generation, vars.population);
@@ -392,6 +397,15 @@ function updatePopulation(population){
     population;
 }
 
+// Update dissolved gasses
+function updateDissolvedGasses(oxygen, c02){
+    document.getElementById("oxygenPercent").textContent =
+    "O2: " + oxygen + "%";
+    document.getElementById("carbonDioxidePercent").textContent =
+    "CO2: " + c02 + "%";
+}
+
+
 //! Checks if the player is extinct
 function checkExtinction(population){
     if(population <= 0){
diff --git a/scripts/gui/thrive_gui.html b/scripts/gui/thrive_gui.html
index 516787460d6..e98479589ab 100644
--- a/scripts/gui/thrive_gui.html
+++ b/scripts/gui/thrive_gui.html
@@ -121,7 +121,7 @@
         <div class="oxygen">
           <span id="oxygenTab"></span>
           <div id="OxygenIcon"></div>
-          <span id="oxygenPercent">O2: 20%</span>
+          <span id="oxygenPercent">O2: 21%</span>
         </div>
         <!-- c02 percentage -->
         <div class="carbondioxide">
diff --git a/scripts/microbe_stage/biome.as b/scripts/microbe_stage/biome.as
index 1819c39f50a..46f1bb9709a 100644
--- a/scripts/microbe_stage/biome.as
+++ b/scripts/microbe_stage/biome.as
@@ -96,6 +96,17 @@ void setBiome(uint64 biomeId, CellStageWorld@ world){
     GetThriveGame().setBackgroundMaterial(biome.background);
     //Update biome for process system
     world.GetProcessSystem().setProcessBiome(biomeId);
+
+    // Update oxygen and carbon dioxide numbers
+    auto oxyId = SimulationParameters::compoundRegistry().getTypeId("oxygen");
+    auto c02Id = SimulationParameters::compoundRegistry().getTypeId("carbondioxide");
+    GenericEvent@ updateDissolvedGasses = GenericEvent("UpdateDissolvedGasses");
+    NamedVars@ vars = updateDissolvedGasses.GetNamedVars();
+    vars.AddValue(ScriptSafeVariableBlock("oxygenPercent",
+        world.GetProcessSystem().getDissolved(oxyId)*100));
+    vars.AddValue(ScriptSafeVariableBlock("co2Percent",
+        world.GetProcessSystem().getDissolved(c02Id)*100));
+    GetEngine().GetEventHandler().CallEvent(updateDissolvedGasses);
 }
 
 void setSunlightForBiome(CellStageWorld@ world){
diff --git a/scripts/microbe_stage/microbe_operations.as b/scripts/microbe_stage/microbe_operations.as
index 65df873c3be..9e0fbfa6a55 100644
--- a/scripts/microbe_stage/microbe_operations.as
+++ b/scripts/microbe_stage/microbe_operations.as
@@ -289,8 +289,10 @@ void respawnPlayer(CellStageWorld@ world)
         sceneNodeComponent.Marked = true;
 
         setRandomBiome(world);
+
         cast<MicrobeStageHudSystem>(world.GetScriptSystem("MicrobeStageHudSystem")).
-        suicideButtonreset();
+            suicideButtonreset();
+
         // Reset membrane color to fix the bug that made membranes sometimes red after you respawn.
         MicrobeOperations::applyMembraneColour(world, playerEntity);
     }
diff --git a/src/scripting/script_initializer.cpp b/src/scripting/script_initializer.cpp
index 3cba9c41b3e..6b816a227fb 100644
--- a/src/scripting/script_initializer.cpp
+++ b/src/scripting/script_initializer.cpp
@@ -1150,7 +1150,7 @@ bool
     }
 
     if(engine->RegisterObjectMethod("ProcessSystem",
-           "void getDissolved(CompoundId compoundData)",
+           "double getDissolved(CompoundId compoundData)",
            asMETHOD(ProcessSystem, getDissolved), asCALL_THISCALL) < 0) {
         ANGELSCRIPT_REGISTERFAIL;
     }