On schweizer-illustrierte.ch, advertising and tracking add ≈ 827 g CO₂ per million pageviews (399 g from ad-serving alone) — 0.2× the index average, cleaner than 64% of the sites we measure.
Ad-relevant
827
g CO₂ / 1M pageviews
Ad-serving only
399
g CO₂ / 1M pageviews
10
kg CO₂ / year at 1M pageviews per month
64
% cleaner than the DACH index
52
% 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 →