An air purifier can help keep the air inside your home or office free of dust, pollen, and other unwanted particles. On the other hand, a dehumidifier is designed to regulate humidity levels, which can be particularly helpful if you reside in a humid climate and experience mold growth, musty smells, or discomfort due to high humidity. However, in some instances, using an air purifier and a dehumidifier together may be the best way to tackle indoor air quality issues.