Best air purifiers 2026, tested for UK homes

“Air purifiers are definitely beneficial, particularly for airborne allergies,” says Dr Costa, who formerly ran paediatric allergy services for a major NHS hospital. “The air purifier will collect and remove small particles from the air, reducing your exposure to things that could potentially be harmful.”

But he is clear that not all air purifiers perform to the same standard. “The effectiveness of using an air purifier depends on the quality of the device,” he says. “Not all of them are the same and not all filter out the smallest particles that can cause particular problems, such as cat dander. It is also important you use them alongside any medical treatment recommended by your doctor.”

While most air purifiers will filter out the most problematic small particles (called PM 2.5 and PM 10), some also clear even tinier particles (PM 1), as well as smoke and chemicals known as VOCs (volatile organic compounds) from the air.

Some of the best air purifiers also have extra features like cooling fans, warming heaters, dehumidifier functions and Wi-Fi connectivity, meaning you can control the device from an app on your smartphone.