Best Air Purifier for Bushfire Smoke Australia 2026: What the Health Departments Say

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The best air purifier for bushfire smoke is a HEPA unit sized on its smoke CADR, running in one closed room. For a living area, the Coway Airmega 400 (about $799 on Amazon AU) has a published smoke CADR of 328 cfm, enough for about 46 m². For a bedroom clean room, the Coway Airmega 150 (about $254) handles about 21 m² and is the one I run at home. NSW Health, the Australian Government Department of Health and EPA Victoria all give the same core advice: HEPA filter, small well-sealed room, doors and windows shut.

Smoke is the clearest case for an air purifier in an Australian home, and the one where buying wrong costs most. In the Navy you planned for the threat you could not see; bushfire smoke is mostly fine particles that pass straight through a fly screen and a closed but leaky house. Ionisers, humidifiers and odour absorbers do not deal with them. A correctly sized HEPA purifier in a sealed room does.

What the health departments say

NSW Health: “consider using an air purifier with a high efficiency particle air (HEPA) filter to remove smoke from your indoor air”, and “to work well, the purifier must be used in small, well-sealed areas.” It also advises closing windows and doors, switching the air conditioner to recirculate, and, if your home is smoky, spending time in air-conditioned venues such as libraries and shopping centres, or at the home of a friend or relative with less smoke.

The Australian Government Department of Health says to “seal the room and match the air purifier to the size of the room it is in.” EPA Victoria adds that portable air cleaners “are more effective in rooms smaller than the maximum room size specified by the manufacturer”. All three say humidifiers, negative ion generators and odour absorbers do not remove the fine particles in smoke.

How to set up a clean room

1. Pick the room. Usually a bedroom: small, with a door, and where you spend the longest unbroken stretch. 2. Seal it. Close windows and doors, and use a rolled towel along the bottom of the door if there is a gap. 3. Air conditioner on recirculate, if it has the setting, so it is not pulling outside air in. 4. Run the purifier on high. The US EPA’s wildfire advice is to run it continuously on the highest fan setting while smoke is around. 5. Keep the room clean of other sources. No candles, incense or frying in the clean room. 6. Check the air quality outside on your state’s air quality site, such as NSW Air Quality or EPA AirWatch in Victoria, and only air the house out when it improves.

Sizing for smoke

Use the smoke CADR, the purifier’s tested delivery of clean air against the finest particles. The US EPA rule: smoke CADR in cubic feet per minute of at least two-thirds of the room’s floor area in square feet. At a 2.4 m ceiling that is roughly 12 m³/h per square metre (my arithmetic from the EPA table).

Ignore the “covers up to” figure on the box. Coway’s own US page, for example, lists the Airmega 400 at 1,560 square feet for two air changes an hour, about three times the room the two-thirds rule gives it. For smoke, size up, not down. More detail in our CADR calculator.

The best air purifiers for bushfire smoke

1. Coway Airmega 400: best for living areas

Large rooms and smoke328 cfmsmoke CADR (Coway US)

#1 for smoke | Large rooms

Coway Airmega 400 (AP-2015F)

Suits ~46 m² by the EPA 2/3 rule | 2 pre-filters + 2 Max2 carbon/HEPA filters | 22 to 52 dB(A) | 66 W | Sensitive Choice approved | ~$799 (19 Oct 2026)

Check the Airmega 400 Price on Amazon →

If the family is going to sit out a smoky week in the lounge, this is the one. Coway publishes a smoke CADR of 328 cfm, the highest verified figure in this guide, which covers about 46 m² by the EPA rule. It draws air through two sides, each with a pre-filter and a Max2 filter combining carbon and HEPA, at 66 W. It has no ioniser and is Sensitive Choice approved. Coway rates the filter set at about a year, or 6 to 12 months depending on use; a heavy smoke season sits at the short end. About $799 on Amazon AU, sold by Coway Australia.

2. Coway Airmega 150: best bedroom clean room

Tested at home32.1 dBASilent mode at 1 m (my reading)

#2 | Bedroom clean room

Coway Airmega 150 (AP-1019C)

Smoke CADR 153 cfm (Coway US) | Suits ~21 m² by the EPA 2/3 rule | Pre-filter + carbon + HEPA | 35 W | Sensitive Choice approved | ~$254 (19 Oct 2026)

Check the Airmega 150 Price on Amazon →

The health departments’ advice points to a small sealed room, and for most households that is a bedroom. The Airmega 150’s smoke CADR of 153 cfm covers about 21 m². It is the purifier in my own bedroom: on Silent I measured 32.1 dBA at a metre on a phone app, so it is quiet enough to sleep beside, though on smoke nights you want it on a higher setting. No ioniser, Sensitive Choice approved, 35 W. About $254 on Amazon AU.

3. Philips PureProtect 3200: open living areas

Living areas520 m³/hCADR, GB/T test (Philips)

#3 | Living areas

Philips PureProtect 3200 (AC3220)

HEPA NanoProtect + carbon | No ions or ozone emitted (Philips) | 15 to 47.5 dB(A) | 36 W | Filter ~1 year | ECARF certified | ~$382 (19 Oct 2026)

Check the Philips 3200 Price on Amazon →

Philips quotes 520 m³/h of CADR on the Chinese GB/T test and a maximum room of 135 m². The test standard differs from Coway’s AHAM figures, so you cannot apply the two-thirds rule directly, but it is clearly a living-room class unit at 36 W. Philips states it emits no ions or ozone, which matters for smoke because ionisers do not remove the fine particles. About $382 on Amazon AU.

4. Levoit Core 300: budget small room

Budget$169sold by Levoit’s AU distributor

#4 | Budget

Levoit Core 300

3-stage pre-filter + carbon + HEPA | CADR 187 m³/h (Levoit AU listing) | No ioniser | Sold by VeSync (Levoit) | ~$169 (19 Oct 2026)

Check the Levoit Core 300 Price on Amazon →

For a small bedroom or study on a tight budget, the Core 300 is a three-stage HEPA unit with no ioniser, sold by Levoit’s distributor VeSync. The Australian listing quotes a CADR of 187 m³/h without naming the test standard, so keep it to a small room and close the door. About $169.

Also consider: the Winix Zero (about $279) is a capable mid-size unit, but its PlasmaWave stage generates ions. Winix says it can be switched off; for smoke, switch it off, because ion generators do not remove the fine particles. See the best air purifiers in Australia for the full range.

Comparison table

What does not work

NSW Health, the Department of Health and EPA Victoria all say humidifiers, negative ion generators and odour absorbers do not remove the fine particles in bushfire smoke. The US EPA adds that ozone generators sold as air cleaners have not been approved by any federal agency for occupied spaces, and that ozone can damage the lungs. Surgical and cloth masks do not protect you from smoke either, according to NSW Health. If a product’s main selling point is ions, plasma or ozone, it is the wrong tool for smoke. More in ionisers vs HEPA.

No purifier yet? A box fan with a filter taped to it, known as a Corsi-Rosenthal box, is a recognised stopgap; see our build guide.

Masks and going out

Indoors, the purifier does the work. Outdoors, NSW Health says to consider a P2/N95 mask if you cannot avoid the smoke, and that it “must fit properly with an air-tight seal to work well.” Check the air quality before outdoor exercise or opening up the house. The AirRater app, developed in Australia, was used widely during the 2019 to 2020 fires to track smoke and symptoms.

After the smoke clears

Open up and air the house once outdoor air quality improves. Then check the purifier: vacuum or wash the pre-filter, and expect the HEPA and carbon filters to be closer to replacement than the calendar suggests, because a smoke event loads them fast. If the room still smells of smoke while the particle reading looks fine, the carbon is probably spent. See our filter replacement guide.

Which should you buy?

Protect the living area: Coway Airmega 400. Bedroom clean room: Coway Airmega 150. Open living area for less: Philips 3200. Small room, tight budget: Levoit Core 300. Several rooms: one sized unit per room beats one big unit in the hallway. For bedrooms specifically, see the best bedroom air purifiers.

Final verdict

For bushfire smoke, size on smoke CADR and seal the room. The Coway Airmega 400 is the best air purifier for a smoky living area, and the Airmega 150 the best for a bedroom clean room. Whatever you buy, follow the health departments: HEPA, small sealed room, air conditioner on recirculate, and a fitted P2/N95 mask if you have to go out.

Frequently asked questions

Written by Jayce Love

Former Royal Australian Navy Clearance Diver and TAG-E counter-terrorism operator. Founded Clean and Native to apply the same rigorous thinking to the home environment.

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