Over the past decade, the USA, China, and Brazil have become centers for nanotoxicology development. However, most of the research in these countries is fundamental or directed towards medicine. At the same time, in countries such as India, Malaysia, Saudi Arabia, and Iran, research is more applied. They focus on ecotoxicity, agriculture, and nanosafety research. This leads to the fact that these two large clusters have no joint research and co-citation. There are also two methodological approaches to nanotoxicological research: intensive, typical for scientists from the USA, China, and Brazil, and extensive, typical for Asia's scientists.