# Are ozone-generating air purifiers beneficial for asthma patients? Canonical page: https://clinicsjo.com/en/faq/ozone-generating-air-purifiers-and-asthma Language: en Category: respiratory Publisher: ClinicsJo Published: 2026-09-13T17:52:51.230Z Content updated: 2026-09-13T17:52:51.230Z Translation (ar): https://clinicsjo.com/ar/faq/ozone-generating-air-purifiers-and-asthma No, ozone-generating air purifiers are not beneficial for asthma patients and may cause harm to the lungs and respiratory system. Although some air purifiers are marketed as solutions for indoor environments, ozone itself is a toxic gas that can cause chest pain, coughing, shortness of breath, and throat irritation [\[3\]](). Furthermore, ozone can exacerbate chronic respiratory diseases such as asthma and impair the body's ability to fight respiratory infections [\[3\]](). ## Why is ozone harmful to asthma patients? Ozone is a molecule consisting of three oxygen atoms (O3) [\[2\]](). While the ozone in the upper atmosphere protects us from the sun's ultraviolet rays, ground-level ozone is a harmful pollutant [\[1\]](). The chemical properties of ozone that allow it to react with organic materials also enable it to react with similar organic matter in the human body, leading to lung damage when inhaled [\[3\]](). Regular exposure to ozone can lead to permanent lung damage, and this risk is greater in children because their lungs are still developing [\[2\]](). ## Effectiveness of ozone in removing indoor pollutants Available scientific evidence indicates that at concentrations not exceeding public health standards, ozone does not have an effective capacity to remove indoor air pollutants [\[3\]](). Some reactions between ozone and common indoor chemicals may take months or years, and some do not react with ozone at all [\[3\]](). Furthermore, in cases where ozone does react with other chemicals, it may produce harmful or irritating byproducts [\[3\]](). As for biological pollutants like viruses, bacteria, and mold, ozone levels would need to be 5 to 10 times higher than permitted health limits to sufficiently sanitize the air to prevent these organisms from surviving and multiplying [\[3\]](). This means that effective levels of ozone are considered highly toxic when inhaled. ## Guidelines for asthma patients For patients with asthma and those suffering from respiratory problems, it is important to avoid using ozone generators. Healthy individuals, as well as those with breathing difficulties, can experience respiratory issues when exposed to ozone [\[3\]](). The risks increase during exercise, as larger amounts of ozone are inhaled, increasing the risk of adverse respiratory effects [\[3\]](). - Avoid purchasing or using air purifiers that advertise "active oxygen" or "pure air" as synonyms for ozone; these terms are misleading. Ozone is a toxic gas with properties entirely different from the essential oxygen we breathe [\[3\]](). - Monitor outdoor air quality and avoid physical activity during times when ozone levels are high. Ozone, which results from the reaction of pollutants with sunlight, is typically worse in the summer [\[1\]](). - Use High-Efficiency Particulate Air (HEPA) filters that do not produce ozone to help reduce allergen particles in the home. For more information on the [impact of ground-level ozone pollution on health (Arabic)]() and how to protect yourself, you should always rely on reputable medical sources and consult a specialist physician to manage asthma symptoms. ## Medical references - [Ozone]() - [Ozone]() - [Ozone Generators that are Sold as Air Cleaners | US EPA]() General health education; not a substitute for individualized clinical assessment. Citation URL: https://clinicsjo.com/en/faq/ozone-generating-air-purifiers-and-asthma#answer