diff --git a/src/co2.test.js b/src/co2.test.js
index 9a7af24..cd616b6 100644
--- a/src/co2.test.js
+++ b/src/co2.test.js
@@ -9,9 +9,10 @@ import pagexray from "pagexray";
 import CO2 from "./co2.js";
 import { averageIntensity, marginalIntensity } from "./index.js";
 
+const TwnGridIntensityValue = averageIntensity.data["TWN"];
+
 describe("co2", () => {
   let har, co2;
-
   describe("1 byte model", () => {
     const { TGWF_GREY_VALUE, TGWF_GREEN_VALUE, TGWF_MIXED_VALUE } = ONEBYTE;
 
@@ -484,7 +485,7 @@ describe("co2", () => {
       expect(
         co2.perVisitTrace(MILLION, false, {
           gridIntensity: {
-            device: 565.629,
+            device: 678.87,
             dataCenter: { country: "TWN" },
           },
         }).co2
@@ -493,7 +494,7 @@ describe("co2", () => {
       expect(
         co2.perByteTrace(MILLION, false, {
           gridIntensity: {
-            device: 565.629,
+            device: 678.87,
             dataCenter: { country: "TWN" },
             network: { country: "TWN" },
           },
@@ -542,7 +543,7 @@ describe("co2", () => {
           co2
             .perVisitTrace(MILLION, false, {
               gridIntensity: {
-                device: 561,
+                device: TwnGridIntensityValue,
               },
             })
             .co2.toPrecision(5)
@@ -559,7 +560,7 @@ describe("co2", () => {
           co2
             .perByteTrace(MILLION, false, {
               gridIntensity: {
-                device: 561,
+                device: TwnGridIntensityValue,
               },
             })
             .co2.toPrecision(4)
@@ -641,7 +642,7 @@ describe("co2", () => {
           co2
             .perVisitTrace(MILLION, false, {
               gridIntensity: {
-                dataCenter: 561,
+                dataCenter: TwnGridIntensityValue,
               },
             })
             .co2.toPrecision(5)
@@ -657,7 +658,7 @@ describe("co2", () => {
           co2
             .perByteTrace(MILLION, false, {
               gridIntensity: {
-                dataCenter: 561,
+                dataCenter: TwnGridIntensityValue,
               },
             })
             .co2.toPrecision(5)
@@ -740,14 +741,14 @@ describe("co2", () => {
           co2
             .perVisitTrace(MILLION, false, {
               gridIntensity: {
-                network: 561,
+                network: TwnGridIntensityValue,
               },
             })
             .co2.toPrecision(5)
         )
       ).toBeCloseTo(
         parseFloat(
-          MILLION_PERVISIT_GREY_NETWORK_GRID_INTENSITY_CHANGE.toPrecision(5)
+          MILLION_PERVISIT_GREY_NETWORK_GRID_INTENSITY_CHANGE.toFixed(5)
         ),
         3
       );
@@ -756,7 +757,7 @@ describe("co2", () => {
           co2
             .perByteTrace(MILLION, false, {
               gridIntensity: {
-                network: 561,
+                network: TwnGridIntensityValue,
               },
             })
             .co2.toPrecision(5)
diff --git a/src/constants/test-constants.js b/src/constants/test-constants.js
index c645520..da86f83 100644
--- a/src/constants/test-constants.js
+++ b/src/constants/test-constants.js
@@ -10,37 +10,37 @@ export const ONEBYTE = {
 };
 
 export const SWD = {
-  MILLION_GREY: 0.35418,
-  MILLION_GREEN: 0.30713,
-  MILLION_PERVISIT_GREY: 0.26765,
-  MILLION_PERVISIT_GREEN: 0.23188,
+  MILLION_GREY: 0.40008,
+  MILLION_GREEN: 0.34613,
+  MILLION_PERVISIT_GREY: 0.30206,
+  MILLION_PERVISIT_GREEN: 0.26133,
 
-  TGWF_GREY_VALUE: 0.24963,
+  TGWF_GREY_VALUE: 0.28198,
   TGWF_GREEN_VALUE: 0.54704,
-  TGWF_MIXED_VALUE: 0.21942,
+  TGWF_MIXED_VALUE: 0.24734,
 
-  MILLION_GREY_DEVICES: 0.18417,
-  MILLION_GREY_NETWORKS: 0.04959,
-  MILLION_GREY_DATACENTERS: 0.05313,
+  MILLION_GREY_DEVICES: 0.20803,
+  MILLION_GREY_NETWORKS: 0.05601,
+  MILLION_GREY_DATACENTERS: 0.06001,
   MILLION_GREEN_DATACENTERS: 0.00607,
-  MILLION_GREY_PRODUCTION: 0.06729,
+  MILLION_GREY_PRODUCTION: 0.07601,
 
-  MILLION_PERVISIT_GREY_DEVICE_GRID_INTENSITY_CHANGE: 0.30676,
-  MILLION_PERVISIT_GREY_DATACENTER_GRID_INTENSITY_CHANGE: 0.27876,
-  MILLION_PERVISIT_GREY_NETWORK_GRID_INTENSITY_CHANGE: 0.27800,
+  MILLION_PERVISIT_GREY_DEVICE_GRID_INTENSITY_CHANGE: 0.36087,
+  MILLION_PERVISIT_GREY_DATACENTER_GRID_INTENSITY_CHANGE:  0.31902,
+  MILLION_PERVISIT_GREY_NETWORK_GRID_INTENSITY_CHANGE: 0.31789,
 
-  MILLION_PERBYTE_GREY_DEVICE_GRID_INTENSITY_CHANGE: 0.40631,
-  MILLION_PERBYTE_GREY_DATACENTER_GRID_INTENSITY_CHANGE: 0.36922,
-  MILLION_PERBYTE_GREY_NETWORK_GRID_INTENSITY_CHANGE: 0.36821,
+  MILLION_PERBYTE_GREY_DEVICE_GRID_INTENSITY_CHANGE: 0.47800,
+  MILLION_PERBYTE_GREY_DATACENTER_GRID_INTENSITY_CHANGE: 0.42255,
+  MILLION_PERBYTE_GREY_NETWORK_GRID_INTENSITY_CHANGE: 0.42105,
 
-  MILLION_PERVISIT_GREY_DEVICES_FIRST: 0.13813,
+  MILLION_PERVISIT_GREY_DEVICES_FIRST: 0.15603,
   MILLION_PERVISIT_GREY_DEVICES_SECOND: 0.00092,
   MILLION_PERVISIT_GREY_NETWORKS_FIRST: 0.03719,
   MILLION_PERVISIT_GREY_NETWORKS_SECOND: 0.00025,
-  MILLION_PERVISIT_GREY_DATACENTERS_FIRST: 0.03985,
+  MILLION_PERVISIT_GREY_DATACENTERS_FIRST: 0.04501,
   MILLION_PERVISIT_GREY_DATACENTERS_SECOND: 0.00027,
   MILLION_PERVISIT_GREEN_DATACENTERS_FIRST: 0.00456,
   MILLION_PERVISIT_GREEN_DATACENTERS_SECOND: 0.00003,
-  MILLION_PERVISIT_GREY_PRODUCTION_FIRST: 0.05047,
+  MILLION_PERVISIT_GREY_PRODUCTION_FIRST: 0.05701,
   MILLION_PERVISIT_GREY_PRODUCTION_SECOND: 0.00034,
 };
diff --git a/src/sustainable-web-design.test.js b/src/sustainable-web-design.test.js
index af19ad8..1aaad79 100644
--- a/src/sustainable-web-design.test.js
+++ b/src/sustainable-web-design.test.js
@@ -80,7 +80,7 @@ describe("sustainable web design model", () => {
   describe("emissionsPerVisitInGrams", () => {
     it("should calculate the correct co2 per visit", () => {
       const energy = swd.energyPerVisit(averageWebsiteInBytes);
-      expect(swd.emissionsPerVisitInGrams(energy)).toEqual(0.6);
+      expect(swd.emissionsPerVisitInGrams(energy)).toEqual(0.68);
     });
 
     it("should accept a dynamic KwH value", () => {