Air purifiers are commonly used in offices and homes in the west to remove particles of dust and make the air cleaner to breath. They are particularly useful for asthmatics who may be allergic to certain types of air-borne impurities. However, the air purifiers are usually installed at a particular point in a room and they can be effective within a certain defined area. Now a company Moneual in South Korea has come up with a novel concept of robotic air purifiers that can go from room to room in search of dirty air and purifiy the air for you! The robot (Rydis 800) moves about on wheels and it is fitted with sensors that allow it to avoid collisions with objects as it travels around various nooks and corners. When not operated, it sits on a charging station so that it is ready for use when needed.