diff --git a/config/research.lua b/config/research.lua
index 6aafc1a9..69dbbfaf 100644
--- a/config/research.lua
+++ b/config/research.lua
@@ -3,6 +3,7 @@
 
 return {
     enabled = true,
+    pollution_ageing_by_research = false,
     queue_amount = 3,
     bonus = {
         enabled = false,
diff --git a/modules/commands/research.lua b/modules/commands/research.lua
index af0a1ed4..fbc204cc 100644
--- a/modules/commands/research.lua
+++ b/modules/commands/research.lua
@@ -43,9 +43,13 @@ local function research_notification(event)
     end
 
     if is_inf_res then
-        if config.bonus.enabled then
-            if event.research.name == 'mining-productivity-4' and event.research.force.technologies['mining-productivity-4'].level > 4 then
-                event.research.force[config.bonus.name] = base_rate + event.research.force.technologies['mining-productivity-4'].level * config.bonus.rate
+        if event.research.name == 'mining-productivity-4' and event.research.level > 4 then
+            if config.bonus.enabled then
+                event.research.force[config.bonus.name] = base_rate + event.research.level * config.bonus.rate
+            end
+
+            if config.pollution_ageing_by_research then
+                game.map_settings.pollution.ageing = math.min(10, event.research.level / 5)
             end
         end