Unlike air quality monitors, which sense and report selected pollutants or environmental factors without cleaning air or delivering therapy, anti-dust mite devices target dust-mite allergen reservoirs using mattress and pillow encasements, humidity control, hot washing, high-efficiency vacuum containment, or other defined methods rather than directly treating asthma or allergy.
The word instead makes this a use-case decision, not a feature-count contest. A situation favors anti-dust mite devices when the required job is to target dust-mite allergen reservoirs using mattress and pillow encasements. A situation favors air quality monitors when the required job is to use one or more sensors to estimate specific pollutants or environmental factors such as particulate matter.