Question

Ozone air purifiers: Can they improve asthma symptoms?

My daughter has asthma. Would she benefit from an ozone air purifier in her room?

Answer

from James T. Li, M.D.

Despite manufacturer's claims, ozone air purifiers don't remove particles from the air that may trigger asthma attacks. In fact, inhaled ozone can make asthma worse.

Ozone generators sold as air purifiers intentionally produce the air pollutant ozone. The ozone molecule contains three atoms of oxygen. Two of these atoms form the basic oxygen molecule. The third atom can detach from the ozone molecule and reattach to molecules of other substances. This changes the chemical composition of the other substances — and forms the basis of manufacturer claims that ozone "purifies" the air. But inhaling ozone, even in small amounts, can irritate the lungs. Specific effects may include throat irritation, coughing, chest pain and shortness of breath, as well as an increased risk of respiratory infections.

Some ozone air purifiers are made with an ion generator or "ionizer" in the same unit. You can also buy ionizers as separate units. Ionizers remove particles from the air, causing them to attach to nearby surfaces or to each other and settle out of the air — but they may generate unwanted ozone.

High-efficiency particulate air (HEPA) filters are more effective in removing allergens from the air, without posing any ozone concerns.

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