This book is primarily intended for the Undergraduates and Post graduate students of Civil Engineering. Air plays a vital role to support the life system of all kind of living things in the biosphere. Quality of the air is being changed day by day, due to the natural and anthropogenic activities. This leads to air pollution, which cause severe impact on the environment. The air pollutants can affect the environment on a global scale. Every man must fight against it on a war - front, instead of wringing his hands in despair. The public must learn to keep their surroundings clean. This book highlights the probable causes of air pollution, suggesting remedial measures for minimizing it.