"Balance" pollution changes for air filtering mod

data-updates.lua

@@ -55,6 +55,14 @@ for key, prototype_type in pairs(data.raw) do
                 end
                 prototype.energy_source.emissions = prototype.energy_source.emissions * multiplier
             end
+            -- Negitive numbers account for air-filtering mod
+            if prototype.energy_source.emissions and prototype.energy_source.emissions < -0.001 then
+                local multiplier = 7
+                if marathon then
+                    multiplier = multiplier / 5
+                end
+                prototype.energy_source.emissions = prototype.energy_source.emissions * multiplier
+            end
         end
     end
 end