De or het asbestsanering?

The correct Dutch article is:

de asbestsanering

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

How to use asbestsanering

the asbestsaneringde asbestsanering
this asbestsaneringdeze asbestsanering
that asbestsaneringdie asbestsanering
our asbestsaneringonze asbestsanering
your asbestsaneringjouw asbestsanering
every asbestsaneringelke asbestsanering
which asbestsanering?welke asbestsanering?
a big asbestsanering / the big asbestsaneringeen grote asbestsanering, de grote asbestsanering