Dear Editor,

we prepared a new graphical abstract to our MS by simplifying the old version. We removed the labels and names of all sources next to the pie chart, and indicated just the three major sources (which make up 84% of particles annually) by inserting these names into the segments. By this modification, we are to communicate the most important message of the work in a clarified and visually more capturing manner.

We wonder if you could kindly approve the new version of the graphical abstract. Thank you in advance.
