If observed from an objective, epistemological standpoint, medicine is not a science. At least, not a science in its own right. The most important, key feature missing is repeatability, which makes the doctor’s job extremely difficult. Doctors are not scientists, but every day, they are called upon to use the results of scientific research. Therefore, they must keep themselves updated, be able to distinguish what is really worth extricating from a huge amount of a literature and use the data exclusively in the interest of their patients. To be effective, medicine must start from a correct, full understanding of the problem, but when particulate pollution is involved, we see too many wrong diagnoses. This book is written by the discoverers of nanopathology and, therefore, is the most advanced in the field. The main topic is how natural, occasionally generated and engineered particles interfere with living organisms, food, drugs and the environment. The book is unique in the cases it shows and, in the methodology, used.