“…About 70% of the publications characterize the chemical composition of the particle extracts [3,7,10,12,[17][18][19]. Out of these 55 publications in 30 articles, also particle characteristics were considered, with the Baverage PM concentration^mentioned most often [10, 19, 27, 29, 31, 34-36, 39, 40, 43, 46, 48, 50-53, 57-59, 63, 66, 67], the shape of the particles was analyzed in 12 publications [3,12,18,28,34,36,38,43,44,53,57,71], and the surface chemistry was considered only in 4 publications [7,18,19,70]. Accordingly, 24 publications did not characterize chemicals attached to the particles [9,11,, and only 7 out of these 24 publications considered other particle characteristics [72,76,78,80,82,87,89], with Baverage PM concentration^being mentioned most often.…”