On idnes.cz, advertising and tracking add ≈ 8,132 g CO₂ per million pageviews (6,145 g from ad-serving alone) — 1.6× the index average, cleaner than 19% of the sites we measure.
Ad-relevant
8132
g CO₂ / 1M pageviews
Ad-serving only
6145
g CO₂ / 1M pageviews
98
kg CO₂ / year at 1M pageviews per month
19
% cleaner than the DACH index
24
% 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 →