Air pollution is caused due to the release of harmful components like greenhouse gases, biological molecules and particulates into the atmosphere. Air pollution poses the threat of critical diseases like asthma, lung cancer, cardiovascular diseases and allergies in human beings, and also causes harm to food crops and animals. Both human activities and natural processes lead to air pollution. Human activities result in the release of harmful substances into the air like carbon dioxide, nitrogen oxides, sulphur oxides, carbon monoxide, chlorofluorocarbons, etc. The main cause of air quality degradation and air pollution are anthropogenic activities, like fossil fuel burning, waste deposition in landfills, use of nuclear weapons, fumes from aerosol sprays, controlled burning practices, etc. This book provides significant information on this discipline to help develop a good understanding of air pollution and air quality degradation and their related aspects. It presents researches and studies performed by experts across the globe. This book will prove to be immensely beneficial to students and researchers in this field.