On momondo.com, advertising and tracking add ≈ 3,248 g CO₂ per million pageviews (1,233 g from ad-serving alone) — 0.6× the index average, cleaner than 39% of the sites we measure.
Ad-relevant
3248
g CO₂ / 1M pageviews
Ad-serving only
1233
g CO₂ / 1M pageviews
39
kg CO₂ / year at 1M pageviews per month
39
% cleaner than the DACH index
62
% 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 →