On sapo.pt, advertising and tracking add ≈ 2,398 g CO₂ per million pageviews (1,840 g from ad-serving alone) — 0.5× the index average, cleaner than 44% of the sites we measure.
Ad-relevant
2398
g CO₂ / 1M pageviews
Ad-serving only
1840
g CO₂ / 1M pageviews
29
kg CO₂ / year at 1M pageviews per month
44
% cleaner than the DACH index
23
% 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 →