Air quality is the measure of how much polluted is the air presently. Absence of dilution of air pollutants or increase in the emission of air pollutants in the atmosphere can lead to deteriorated air quality. Different nations use different air quality indices to assess national air quality standards. Some of these are air quality health index, pollutant standards index and air pollution index. Assessment of air quality needs air pollutant concentration information over a specified period of time that is gained from an air monitor. Poor air quality causes harm to public health and leads to respiratory and cardiovascular problems. Use of masks and avoidance of outdoor exertion activities are some of the ways to deal with poor air quality. This book is compiled in such a manner, that it will provide in-depth knowledge about the theory and practice of this field. The topics included in this book are of utmost significance and bound to provide incredible insights to readers. This book is meant for students who are looking for an elaborate reference text on air quality.