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Normally once the heavy particles “fall out”, they are only reintroduced to the air by vacuuming, or similarly vigorous activity. Where allergy symptoms, which are aggravated by pollens and spores, are a concern, continuous cleaning is strongly encouraged. To recap, when removing household dust is the major benefit you are seeking, you should operate your air cleaner during and following periods when dust is being generated or “stirred up”. For pollens and spores which aggravate an allergy condi