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Air Quality Index (AQI) simplifies outdoor air conditions on a scale from 0 to 500. Lower is better. If AQI is high, use a higher-rated filter indoors and limit outdoor exposure.
From smoke, combustion; tiny enough to reach lungs and bloodstream.
Dust, pollen, mold spores—irritating to eyes, nose, and throat.
Forms in sunlight; can irritate airways and worsen asthma.
From traffic, gas appliances; respiratory irritant.
Industrial sources; can trigger breathing issues.
From paints, cleaning products, cooking; contribute to odors and indoor irritation.
Why it matters: Poor air quality can aggravate asthma/allergies, reduce sleep quality, and increase long‑term health risks. Indoors, a well‑sealed home with the right filter helps reduce exposure.
Everyday Value
Great for Allergies
Best for Smoke
Run HVAC on "Auto" with a MERV 8–11 filter; replace on schedule.
Consider MERV 11; close windows during high pollen hours.
Upgrade to MERV 11–13; run fan to recirculate through filter; avoid indoor burning/candles.
Use MERV 13; create a clean room; use portable HEPA if available; seal drafts.
Stay indoors; MERV 13+ run HVAC continuously; change filters more often.
Shelter indoors; MERV 13+ change filter once visibly loaded; avoid introducing smoke/chemicals.
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