Air pollution is a condition when the Earth's atmosphere or environment contains excessive quantities of harmful substances including gases, particles and biological molecules. The sources of air pollution can be broadly divided into natural sources and man-made sources. Some of the natural sources are dust, methane emitted by animals and radon gas from radioactive decay in the Earth's crust. A few of the man-made sources are fossil fuel power stations and motor vehicles. Air pollution can cause serious diseases, allergies and even death among humans. It also harms other living organisms like animals and affects food crops. Air pollution can also damage natural and built environment. The topics included in this textbook on air pollution are of utmost significance and bound to provide incredible insights to readers. Different approaches, evaluations and studies related to this problem have been included in this book. It will serve as a valuable source of reference for those interested in this field.