Unlike allergen reducer devices, which reduce a specific allergen reservoir or exposure pathway using device-specific methods, air quality monitors use one or more sensors to estimate specific pollutants or environmental factors such as particulate matter, carbon dioxide, volatile compounds, temperature, or humidity.
The word instead makes this a use-case decision, not a contest over secondary capabilities. 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. A situation favors allergen reducer devices when the required job is to reduce exposure to a defined allergen through filtration.