Air pollution is mainly due to the particulates such as dust, liquid droplets, smokes etc. from industries. To reduce air pollution, the contaminants such as particulates should be removed from the air. The scientists and environmental well-wishers came out with several kinds of innovation to purify the air from the particulate contaminants. These particulates are hazardous to the living organisms, leads to lung and respiratory disorders such as asthma, coughing and other difficulties in breathing. This book reviews the cyclone separator and techniques used in cyclone separator.