Ad-carbon intensity of the web's most-visited sites
The advertising and tracking CO₂ that the world's biggest sites load on every visit — grams of CO₂ per million pageviews, measured on the live electricity grid.
Index average 5,244 g/1M · 664 sites measured · refreshed monthly
Ad-relevant carbon — ad servers, tag managers, consent tools and tracking pixels — computed from public homepage crawl data on each country's live grid. An estimate of a site's ad-tech footprint, not a campaign figure. How we measure →