Colds, flus and other viruses can happen easily inside a home when airflow is restricted, allowing air-borne bacteria and viruses to circulate indoors. The best air purifiers on the market are the ones that feature a High Efficiency Particulate Air (HEPA) filter, which, by common standards, is 99.97% efficient at removing particles that are no more than 0.3 microns in diameter, including deadly particulates such as PM 2.5 and PM 0.5.

One important thing to note is that even the best HEPA filter will not kill viruses, as viruses are submicron in size which makes them difficult to capture. However, an air purifier with a HEPA filter is able to eliminate harmful airborne microorganisms, as well as allergens such as dust and pollen from the air. To help you breathe safer and healthier at home, we’ve selected five HEPA air purifiers that will keep the indoor air clean.

See also: 5 Best Personal Air Purifiers In Hong Kong