On flughafen-zuerich.ch, advertising and tracking add ≈ 1,481 g CO₂ per million pageviews (9 g from ad-serving alone) — 0.3× the index average, cleaner than 53% of the sites we measure.
Ad-relevant
1481
g CO₂ / 1M pageviews
Ad-serving only
9
g CO₂ / 1M pageviews
18
kg CO₂ / year at 1M pageviews per month
53
% cleaner than the DACH index
99
% of the footprint is tracking overhead, not ad-serving
Measured on the live electricity grid from public page-load data — an estimate of a site's ad-tech architecture, not a measured campaign figure. See the methodology →