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HEPA Air Purifiers: What They Do and How to Choose
A HEPA air purifier traps tiny particles such as dust, pollen, pet dander and smoke particles as air passes through its filter. It does not remove gases or odours well unless it also has a carbon filter, and it cannot fix mould, radon or secondhand smoke at the source. Choose by room size and avoid ozone makers.
Written by the PureLung label deskUpdated · 5 min read
How HEPA works
A true HEPA filter is made of a dense mat of fibres that catches at least 99.97 percent of particles of 0.3 micrometres in tests. A fan pulls room air through it, and the filter keeps the particles. Over time, more air passes through, and particle levels in the room fall.
What it can help with
Fine particles from wildfire smoke, cooking, dust, pollen, pet dander and some tobacco smoke particles. For people with asthma or allergy, a purifier in the bedroom may reduce exposure while sleeping (AirNow, Air Quality Index).
What it cannot do
It does not remove gases such as radon, carbon monoxide or many chemical vapours. A carbon layer can reduce some odours and vapours, but capacity is limited. It does not cure mould or fix a leak. It does not make smoke harmless if the source continues. It does not clean your lungs.
How to choose
Match the device to the room.
| Feature | Why it matters |
|---|---|
| True HEPA | Captures fine particles |
| Clean air delivery rate | Higher means faster cleaning, match to room size |
| Noise | A loud unit gets turned off |
| Filter cost | Replacement adds to long-term cost |
| Ozone | Avoid models that make ozone |
Placement and use
Put the unit away from walls and furniture, so air flows freely. Keep doors and windows closed while it runs on smoky days. Run it on a medium setting at night and on high for short bursts. Change filters on schedule.
PureLung: 60 capsules a bottlePacks of 1, 3 or 6 bottles · live price shown at checkout · guarantee as printed on the live listing
See packsOzone and ionisers
Some devices produce ozone, which irritates the lungs and can worsen asthma. Check the model against the California Air Resources Board list of certified cleaners, or choose plain HEPA units.
An air purifier can lower particle levels. Claims that a device treats a disease or prevents illness go beyond the evidence.
Cost and alternatives
A do-it-yourself filter made with a box fan and a MERV 13 furnace filter can help on a budget. Source control still matters most: no smoking indoors, fix damp and cook with ventilation (ALA, Tips to Keep Your Lungs Healthy).
What does the PureLung label say?
The label shows 60 capsules, a serving of 2 and a 600 mg Proprietary Blend of eleven names with no single amount; it names no disease.
| Item | As printed |
|---|---|
| Form and count | Capsules, 60 per bottle; serving size 2 capsules; 30 servings |
| Blend per serving | Proprietary Blend, 600 mg: eleven names, no single amount printed |
| Inactive | Rice Flour, Magnesium Stearate, Silica Dioxide |
| Distributor | MJO, Sheridan, WY 82801 |
Where capsules fit
They do not. A purifier acts on air, a capsule acts on nothing in your room. If you choose to spend money for easier breathing at home, a purifier or a damp repair is better supported than a lung supplement. See the indoor air post.
3-bottle pack
3 bottles: 180 capsules
Not listed on the packNot listed on the pack a bottle
Shipping shown at checkout · Guarantee as printed on the live listing
Order 3 bottles
6-bottle pack
6 bottles: 360 capsules
Not listed on the packNot listed on the pack a bottle
Shipping shown at checkout · Guarantee as printed on the live listing
Order 6 bottlesPrices are filled in once the live listing is confirmed. A single bottle is also sold. Check your medicines with your doctor or pharmacist before you order, and keep using every inhaler and prescribed medicine.
FAQ01
PureLung questions people ask
Do purifiers help asthma?
They may reduce airborne triggers.
Is HEPA the same as HEPA-type?
Not always. Check for true HEPA.
How often are filters changed?
Follow the maker, often every 6 to 12 months.
Do they remove viruses?
They can capture virus-carrying particles, with limits.
Do they replace medicine?
No.
Who wrote this02
Written and reviewed by
Pages built from the label images, seller information and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is the information site for a U.S. authorized retailer for PureLung. It is not the manufacturer or the distributor named on the label. We earn money when you buy through our order links.
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Check your medicines first, keep every inhaler and prescribed medicine, read the directions on the bottle that arrives, then pick a pack of 1, 3 or 6 bottles. The checkout shows the live price, any shipping and the guarantee.
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