CADR is an acronym for Clean Air Delivery Rate and is a performance rating that measures the volume of purified air an air treatment system can deliver in one minute. It is considered by many as the best method for determining a portable air treatment system’s initial room cleaning performance as it challenges the entire air treatment system with contaminants that are common to households such as, smoke, dust, and pollen. The testing is done in a real room and has been reviewed and referenced by the U.S. Federal Trade Commission and the U.S. Environmental Protection Agency. Atmosphere Mini Air Treatment System's CADR is no less than 130 cfm.