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https://wizzair.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
52
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
1.82g CO2 per view
FIX
1.82g CO2 per view
Warning::
1.82g CO2 per page view
This page transfers 6.4 MB, producing an estimated 1.82g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.34g, network 0.31g, end-user device 1.17g.
Got: 1.82g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 218.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 218.1 kg of CO2 annually — equivalent to charging 27261 smartphones.

1.82g

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
1.82g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.34g
Network
0.31g
End-user device
1.17g
At 10,000 monthly views: Monthly: 18.2 kg · Annual: 218.1 kg · ≈ 27261 smartphone charges
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
Info::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 HostingNot Green Hosted
Hosting AWS✗CDN AWS CloudFront✗

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
84th percentile
FIX
84th percentile
Warning::
1.82g 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

1.82g

84th percentile

Cleaner than 16% of websites

✗ Above the median website

vs Median 203% more
vs Target 263% more
C
Transfer Efficiency
Action
60% efficient
REVIEW
60% efficient
Warning::
Transfer efficiency: 60%
An estimated 2603 KB (40%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2603 KB of unused JavaScript. This wasted data produces 0.72g of unnecessary CO2 per page view.
60% efficient

Total waste: 2603 KB (40% of page weight)

Unused JS 2603 KB

0.72g unnecessary CO2 per visit

Actual transfer 6571 KB
Theoretical minimum 3967 KB
Potential savings 2603 KB (0.72g 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
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 411 KB (vs 6571 KB first visit). 264 of 268 resources are served from browser cache, saving 1.70g CO2 per repeat visit.
Info::
Repeat visit: 0.11g CO2 (first visit: 1.82g)
First visit
6571 KB
Repeat visit
411 KB

94% reduction on repeat visits

Saving 1.70g CO2 per returning visitor

264 resources served from cache · 4 resources re-downloaded

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

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