On bmo.com, advertising and tracking add ≈ 6,546 g CO₂ per million pageviews (384 g from ad-serving alone) — 1.2× the index average, cleaner than 25% of the sites we measure.
Ad-relevant
6546
g CO₂ / 1M pageviews
Ad-serving only
384
g CO₂ / 1M pageviews
79
kg CO₂ / year at 1M pageviews per month
25
% cleaner than the DACH index
94
% 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 →