They mean oil-industry-beneficial ads. The source article[0] words it better:

> The Hague became the first city in the world to ban advertisements promoting fossil fuel products and carbon-intensive services including cruise ships and air travel.

[0] https://www.bnnbloomberg.ca/investing/2024/09/13/the-hague-i...

Shell ads are quite common in the Netherlands. Usually it's shell trying to greenwash itself.

When I was living in Belgium I frequently saw ads for heating oil, as they were battling a rise in more stringent emission standards for home furnaces, and they were losing against the natural gas ones, whose emissions are much much lower.