Since a while we have a problem with those little flies, which generally are present near the plants (or flying along your ears when you are reading or working on the computer). As I do not want to use any spray, because I don't expect it to be sustainable, but just killing them one by one does not seem a solution. I've tried for a while, but I feel each time they become faster (maybe natural selection of the fastest?). Before we had some fruit flies, which were easy as you just had to make sure to keep garbage closed and fruits to be covered.
What are they? And what can I do against them?
Additional information: The 'flies' are about 3-4 mm long and I'm living in Belgium.
They seem to be gnats (or fungus gnats), someone knows its name in Dutch?