Air pollution is caused by the presence of harmful substances in the air, like gases, particulates, biological molecules, etc. This can lead to various allergies, diseases and also death in humans. It also causes harm to animals and food crops. It is responsible for damage to the environment. Air quality measurement, analysis and monitoring are therefore essential for controlling air quality degradation and measuring the degree of damage. Air quality is monitored by measuring the air pollutant concentrations using specialized equipment and methods. The data obtained is then interpreted to understand the health effects associated with exposures to such concentrations. Air quality index is a measure of how polluted the air is. An increase in air quality index signifies that a larger population is vulnerable to adverse health effects. This book aims to shed light on some of the unexplored aspects of air quality measurement, analysis and monitoring. Different approaches, evaluations, methodologies and advanced studies on air quality have also been included. Students, researchers, experts and all associated with this field will benefit alike from this book.