Air purification is addressed as an interdisciplinary topic, covering the formation of air pollutants, their spread and transformation in the atmosphere, the effects on humans, animals, plants, and material goods, as well as reduction techniques for various sources. The presentation of current issues such as vehicle emissions, catalysts, ozone, forest damage, polychlorinated dioxins, and furans, along with a thorough treatment of measurement technology and an overview of regulations, completes the work.