De or het geurbelasting?

The correct Dutch article is:

de geurbelasting

Rule Words ending in -ing: almost always de. See the rule

How to use geurbelasting

the geurbelastingde geurbelasting
this geurbelastingdeze geurbelasting
that geurbelastingdie geurbelasting
our geurbelastingonze geurbelasting
your geurbelastingjouw geurbelasting
every geurbelastingelke geurbelasting
which geurbelasting?welke geurbelasting?
a big geurbelasting / the big geurbelastingeen grote geurbelasting, de grote geurbelasting