Public domain photos

The image shows a tree with a sign attached to its trunk that reads "Ich bin ein feinstaubfilter" and a bicycle parked next to it. In the background, there are vehicles on the road, buildings, and a clear blue sky.

The image shows a tree with a sign attached to its trunk that reads "Ich bin ein feinstaubfilter" and a bicycle parked next to it. In the background, there are vehicles on the road, buildings, and a clear blue sky.Open in library