This new slim version of the classic 203 Smokestop air purifier effectively removes tobacco smoke, Traffic Pollution, fumes, chemicals and odours better than any other brand we know of. The patented hepasilent filter also removes other pollutants such as allergens, pollens, mould spores, dust and pet dander. We think its the ideal companion particularly for anyone who suffers from Chemical Sensitivity or wants protection from smoke and odours.