On exlibris.ch, advertising and tracking add ≈ 2,240 g CO₂ per million pageviews (37 g from ad-serving alone) — 0.4× the index average, cleaner than 46% of the sites we measure.
Ad-relevant
2240
g CO₂ / 1M pageviews
Ad-serving only
37
g CO₂ / 1M pageviews
27
kg CO₂ / year at 1M pageviews per month
46
% cleaner than the DACH index
98
% 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 →