No. Dehumidifiers condense ambient humidity. They absorb dust mites, bacteria and some toxic particles in the process, but only superficially since their only function is to control humidity levels in a room. Air purifiers, on the other hand, do a much deeper cleaning of the environment, as that is their sole objective. They use three and four filters, in addition to other technologies, to remove a wide range of contaminants. From particulate matter of various sizes to pathogens, viruses, dust mites, pollen, and concentrations of gases that are toxic to your health.