Skip to content
https://ms.gov

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
54
GRADE
F
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.80g CO2 per view
FIX
1.80g CO2 per view
Warning::
1.80g CO2 per page view
This page transfers 6.4 MB, producing an estimated 1.80g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.33g, network 0.31g, end-user device 1.16g.
Got: 1.80g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 216.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 216.5 kg of CO2 annually — equivalent to charging 27066 smartphones.

1.80g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 16% of websites

Sustainable Web Design model v4 · Page size: 6.4 MB

Your site
1.80g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.33g
Network
0.31g
End-user device
1.16g
At 10,000 monthly views: Monthly: 18.0 kg · Annual: 216.5 kg · ≈ 27066 smartphone charges
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
84th percentile
FIX
84th percentile
Warning::
1.80g CO2 — above the median website (0.60g)
Heavier than an estimated 16% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 84th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.80g

84th percentile

Cleaner than 16% of websites

✗ Above the median website

vs Median 201% more
vs Target 261% more
C
Transfer Efficiency
Action
74% efficient
REVIEW
74% efficient
Warning::
Transfer efficiency: 74%
An estimated 1707 KB (26%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1707 KB of unused JavaScript. This wasted data produces 0.47g of unnecessary CO2 per page view.
74% efficient

Total waste: 1707 KB (26% of page weight)

Unused JS 1707 KB

0.47g unnecessary CO2 per visit

Actual transfer 6524 KB
Theoretical minimum 4817 KB
Potential savings 1707 KB (0.47g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 20 KB (vs 6524 KB first visit). 173 of 178 resources are served from browser cache, saving 1.80g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.80g)
First visit
6524 KB
Repeat visit
20 KB

100% reduction on repeat visits

Saving 1.80g CO2 per returning visitor

173 resources served from cache · 5 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback