They are so miniature that they are invisible to the human eye, so light that they can float freely in the air. However, their influence on the weather, climate, and atmosphere is very significant. They are responsible for, among other things, the destruction of ozone or the transformation of mercury in the environment into a more poisonous form. We are talking about salty sea aerosols arising from salty ice in polar regions. The exact mechanism of their formation was unclear for a long time. The answer was currently brought by the research of Brno scientists from the Environmental Electron Microscopy group of the Institute of Instrumentation of the Academy of Sciences of the Czech Republic (ÚPT) led by doc. Ing. et Ing. Vilém Neděla, Ph.D, in cooperation with the group of doc. Dominik Heger from the Department of Chemistry, Faculty of Science, MU and Dr. Xin Yang of the British Antarctic Survey (Cambridge, UK).