The California Air Resources Board on Thursday banned popular in-home ozone air purifiers, saying studies have found that they can worsen conditions such as asthma that marketers claim they help to ...

Here's how to create your own personal Stage 2 Smog Alert: Buy a personal air purifier that emits high levels of ozone. These devices are marketed to reduce pollen and particulates in room air. One ...

Most people buy air purifiers to breathe cleaner air, but not everyone realises that some models release ozone during use. This invisible gas, often promoted as a benefit, can actually irritate the ...

Correction: This article in its original form was inaccurate. The study involved two types of air purifiers, those commonly called ionic and those that employ a process called ozonolysis. Only those ...