HEPA Filters and Allergy Control

The mechanics of High-Efficiency Particulate Air.

Medically reviewed by Dr. Sarah Jenkins, MD, FACAAI

Verified Reviewer

Board Certified Allergist & Immunologist · Clinical Allergy, Asthma & Immunology

Stanford University School of Medicine

Updated March 2026·Annual review cycle

Our editorial process: All content on WhatAreAllergies.com is written by medical writers and reviewed by board-certified allergists and immunologists. We follow ACAAI, AAAAI, WAO, and ARIA clinical guidelines. Content is updated on an annual review cycle or when major guidelines change. We do not accept advertising influence on editorial content. Read our editorial policy →

The Gold Standard in Filtration

True HEPA filters are certified to capture 99.97% of particles that are 0.3 microns in diameter. This makes them highly effective at removing pollen, pet dander, mold spores, and dust mite feces from indoor air environments.

Filter Type	Effectiveness
True HEPA	Catches 99.97% of particles down to 0.3 microns
HEPA-type	Not certified; captures larger particles only

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

Medical Review

Dr. Sarah Jenkins, MD, FACAAI

Board Certified Allergist & Immunologist

Clinical Allergy, Asthma & Immunology

Stanford University School of Medicine

Written by

Dr. Michael Chen, MD, PhD

Clinical Immunologist & Researcher

Translational Immunology, Biologic Therapies

Johns Hopkins University

All contributors hold active board certification in allergy, immunology, or a related specialty. View full credentials →

Medical References & Citations

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
database2025
American College of Allergy, Asthma & Immunology (ACAAI) "Allergy Facts and Figures" — ACAAI Clinical Resources.
View source
3
review2025
World Allergy Organization (WAO) "White Book on Allergy — 2025 Update" — World Allergy Organization.
View source
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
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.