Upon reception, samples will be treated following relevant safety measures and subjected to DNA extraction and analysis of eukaryote (fungi, plants, animals, protists) and bacterial diversity following best practices (www.nature.com/articles/s41586-018-0386-6). The molecular and statistical analyses of this project will provide answers to our questions regarding the distribution of dust-associated microbial biodiversity. The results are communicated step-by-step to participants. The final analyses are published in high-ranking scientific journals, with all data sets made publicly available over the PlutoF work bench / biodiversity portal (plutof.ut.ee) to each participant.