This book is a unique merger of two divergent parts. The first part is a presentation of the existing knowledge on the characteristics of basic air pollutants and their documented impact on human health. The focus is on the main gaseous, airborne particles (including fiber particles) and biological pollutants. The first part is a literature review conducted by the authors who are actively engaged in studying the described pollutants. The second part contains a study of methods used for the evaluation and prognosis of health effects to exposure to particular pollutants.