Do Air Purifiers Work? What to Know Before You Buy
Air purifiers are everywhere, but what do they actually do? A purifier with a HEPA filter pulls air through a filter that captures fine particles such as dust and pollen.
What they can do
A properly sized purifier can reduce airborne particles in the room where it runs, and many people find the room feels fresher.
What they cannot do
They do not clean surfaces, replace ventilation or cure health conditions. If you have allergies or asthma, ask a doctor for advice.
How to choose
- Match the rated room size to your room.
- Check the noise on the lowest speed for bedrooms.
- Look up replacement filter prices before you buy.
Our top pick
Best for dusty or stuffy rooms
HEPA Air Purifier
A room air purifier with a HEPA filter designed to capture dust, pollen and other airborne particles.
- HEPA filtration
- Multiple fan speeds with quiet mode
- Filter replacement indicator
Pros
- Can reduce airborne dust and pollen in the room
- Quiet night modes on many models
Cons
- Replacement filters are an ongoing cost
- Only cleans the room it is sized for
Keep windows ventilated and clean regularly. A purifier works best as part of a healthy home routine.
FAQ
How often should I change the filter?
Follow the maker’s guidance. Many filters last several months, depending on use and air quality.
Can I run it all night?
Most are designed for continuous use, and many have quiet night modes.
Home product researcher. We read the reviews so you don’t have to.