Honeywell HEPA purifiers capture 99.97% of particles ≥0.3 µm, reduce dust, pet dander, and pollen, and work best when sized to the room, maintained per the manual, and paired with ventilation and cleaning.
Allergic reactions occur when the immune system misidentifies harmless substances as threats. This article outlines common triggers - seasonal pollen, foods, drugs, insect stings, and pet or dust-mite-related asthma - how to recognize severe reactions like anaphylaxis, and standard diagnostic and treatment options including avoidance, medications, and immunotherapy.