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Updated May 2026·Annual review cycle

Our editorial process: All content on WhatAreAllergies.com is written and reviewed by our editorial team following published guidelines from ACAAI, AAAAI, WAO, and ARIA. Content is updated annually or when major guidelines change. This content is educational only — not a substitute for professional medical advice. We do not accept advertising influence on editorial content. Read our editorial policy →

CADR Ratings Explained

When selecting an air purifier, the Clean Air Delivery Rate (CADR) determines how fast the unit can clean the air within a specific room size. Purifiers should run continuously in the bedroom for maximum benefit.

MetricSignificance
CADRMeasures volume of filtered air delivered
Room SizeUnit must match square footage to be effective

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Frequently Asked Questions

Is this condition permanent?
Allergies can be lifelong, but symptoms often fluctuate. Some individuals outgrow specific allergies, while others may develop new ones over time.
Can immunotherapy help?
For many environmental and insect sting allergies, immunotherapy (allergy shots or drops) can fundamentally alter the immune response, providing long-term relief.

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About the Medical Team

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Medical Review

WhatAreAllergies Editorial Team,

Health Editors & Medical Writers

Allergy, Immunology & Clinical Health Content

WhatAreAllergies.com
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Written by

WhatAreAllergies Editorial Team,

Health Content Editor

Clinical Allergy & Immunology Content

WhatAreAllergies.com

Content is written by our editorial team following current clinical guidelines from ACAAI, AAAAI, and WAO. Educational only — always consult a qualified healthcare provider for medical advice. View editorial policy →

Medical References & Citations

  1. 1
    guideline2006

    Sampson HA, et al. "Second symposium on the definition and management of anaphylaxis: Summary report" — Journal of Allergy and Clinical Immunology.

    View source
  2. 2
    database2025

    American College of Allergy, Asthma & Immunology (ACAAI) "Allergy Facts and Figures" — ACAAI Clinical Resources.

    View source
  3. 3
    review2025

    World Allergy Organization (WAO) "White Book on Allergy — 2025 Update" — World Allergy Organization.

    View source
  4. 4
    guideline2024

    National Institute of Allergy and Infectious Diseases (NIAID) "Clinical Guidelines for the Diagnosis and Management of Food Allergy" — National Institutes of Health.

    View source
  5. 5
    guideline2024

    Muraro A, et al. "EAACI food allergy and anaphylaxis guidelines: Diagnosis and management of food allergy" — Allergy — European Journal of Allergy and Clinical Immunology.

This content reflects clinical guidelines current as of the last review date shown above. Always consult a qualified healthcare provider for personalized medical advice.