Weed smoke lingers, with odors sticking to clothes, hair and furniture. It can also travel far, reaching roommates and next-door neighbors.
Not only that… Smoking cannabis indoors has been found to dramatically increase the level of PM2.5 particulate matter – – including carcinogens and toxic chemicals, which can result in serious health effects for smokers and second-hand smokers alike.
Thankfully, a high-powered air purifier filled with a high-quality particle filter and a good amount of pelleted activated carbon can remove both the gases and the particles generated by weed smoke.
Since 2020, I have tested and reviewed over 130 different air purifiers from different brands, and these are my top picks for weed smoke right now:
1. Best for most people: Alen BreatheSmart 75i (with the Fresh Filter)
A smart air purifier with HEPA H13 filter and 3.6 lbs of pelleted activated carbon to remove unwanted marihuana odors.
This is the most powerful air purifier in Alen’s BeatheSmart range. It has an estimated PM1 CADR of 333 cfm at top speed and can provide five air changes per hour in rooms of up to 448 sq. ft. (41 m²).
It comes with three layers of filtration: a removable pre-filter, a HEPA H13 filter, and a layer of pelleted activated carbon.
Alen offers multiple filter options for the 75i, but for weed smoke, I recommend the Fresh filter, which comes with 3.6 lbs of pelleted activated carbon.
The 75i comes with a highly accurate laser particle sensor that informs the air quality indicator light at the top.
It completed our particle removal test in 18 minutes at top speed. Based on this result, we estimate a PM1 CADR of 333 cfm.
PROS
| Clean air delivery rate (CADR): | – Top speed PM1 CADR: 333 cfm – Sub-45 dBA PM1 CADR: 164 cfm – AHAM PM2.5 CADR: 351 cfm (dust) |
| Filter technology: | True HEPA H13 filters with activated carbon pellets + Ionizer technology |
| Recommended room size: | 448 sq. ft. (5 air changes per hour) |
| Dimensions: | 27H x 18.5W x 11.5D inches (68.58H x 46.99W x 29.21D cm) |
| Weight: | 27 lbs (12.2 kg) |
| Noise level in decibels from 3 ft. away: | Speed 1: 36.5 dBA Speed 2: 44.7 dBA Speed 3: 51.9 dBA Speed 4: 54.6 dBA Speed 5: 57.5 dBA |
| Electricity consumption in watts: | Standby: 0.75 watts Speed 1: 5.19 watts Speed 2: 13.27 watts Speed 3: 25.85 watts Speed 4: 33.99 watts Speed 5: 47.4 watts |
| Filter lifespan: | 12 – 15 months |
| Manufacturer’s warranty: | Lifetime (with product registration & active filter subscription) |
| Country of origin: | United States |
| Country of manufacture: | China |
2. Best for intense weed odors: AC Infinity CLOUDLINE S8 fan with refillable carbon filter
With 16 lbs. (or 7.2 kg) of activated carbon, you’ll struggle to find an air cleaner with more charcoal to help deal with serious VOCs from weed smoke.
If you are dealing with strong odors from marihuana smoke, you will need A LOT more carbon than what you usually get with traditional air purifiers. For those cases, I recommend building yourself a specialist odor-busting device with parts from AC Infinity.
Our AC Infinity CLOUDLINE S8 outperformed the mighty Austin Air HealthMate in our VOC removal tests. Be aware that performance dropped when set to its highest fan speed, so I suggest sticking to speed 5 and below.
The 8-inch Carbon Filter comes with 7.2 kg (or 16 lbs) of activated carbon pellets. And the filter is refillable, so you’ll save a fortune in the long run.
To build my AC Infinity unit, I spent $407.99 to buy a CLOUDLINE S8 fan, two noise reduction clamps, a pre-filter cloth and an 8-inch Carbon Filter. By the way, the carbon filter comes with two years’ worth of carbon refills.
The fan blades are exposed at the top, so I covered them with a circular piece of carbon-impregnated fabric that I cut out from an old Coway Mighty filter.
CONS
PROS
| Filter technology: | VOC and odor adsorption |
| Carbon type: | Australian RC412 at 1200+ IAV (38mm thickness) |
| Carbon quantity: | 16 lbs (7.2 kg) |
| Airflow: | 857 cfm |
| Dimensions: | Fan: 3.3 x 2.9 x 0.5 inches (8.5 x 3.6 x 1.3 cm) Filter: 18.1 x 10.9 inches (46 x 27.7 cm) |
| Noise level in decibels from 3 ft. away: | Speed 1: 37.6 dBA Speed 2: 45.7 dBA Speed 3: 50.8 dBA Speed 4: 57.2 dBA Speed 5: 61.9 dBA Speed 6: 66.5 dBA Speed 7: 71.9 dBA Speed 8: 74.9 dBA Speed 9: 77.8 dBA Speed 10: 79.3 dBA |
| Electricity consumption in watts: | Speed 1: 3.7 watts Speed 2: 7.4 watts Speed 3: 12.3 watts Speed 4: 20.2 watts Speed 5: 30.3 watts Speed 6: 43.2 watts Speed 7: 60.3 watts Speed 8: 86.2 watts Speed 9: 113.2 watts Speed 10: 148 watts |
| Filter lifespan: | 12 months |
| Manufacturer’s warranty: | 2 years |
| Country of origin: | United States |
| Country of manufacture: | China |
Austin Air HealthMate
The filter inside the HealthMate is packed with 15 lbs of activated carbon and zeolite mix and is bigger than most small air purifiers you’ll find at the top of Amazon – see how it compares to the Levoit Core 300S.
It is great at removing odors and VOCs from the air, but its particle filtration is on par with much smaller air purifiers so it won’t offer the level of power you’d get from a unit like the Alen BreatheSmart 75i.
3. Best for small spaces: Levoit Core 400S (with Smoke Remover filter)
The Smoke Remover filter comes with 450 grams of pelleted activated carbon – – the most you’ll get from a Levoit unit.
Use the discount code HOUSE10 for 10% off when buying directly from Levoit.
The cylindrical Core 400S from Levoit is a mid-sized air purifier that doesn’t take up much floor space and offers solid air cleaning performance, with the option of supersizing the gas filtration to tackle weed smell in rooms no larger than 373 sq. ft. (35 m²).
It comes with a cylindrical filter with a pre-filter mesh on the outside, a particle filter in the middle, and pelleted activated carbon on the inside.
Make sure to get the Smoke Remover filter, as it comes with 450 grams of activated carbon pellets, so it will be more effective at removing weed odors.
This is the smallest unit I’d recommend – – anything smaller than this won’t be powerful enough to remove weed smoke from the air.
Based on our tests, we estimate a PM1 CADR of 249 cfm, so the 400S can provide five air changes per hour in rooms up to 373 sq. ft.
CONS
PROS
| Clean air delivery rate (CADR): | – Top speed PM1 CADR: 249 cfm – Sub-45 dBA PM1 CADR: 134 cfm – AHAM PM2.5 CADR: 247 cfm (dust) |
| Filtration technology: | Pre-filter, particle filter and pelleted activated carbon |
| Recommended room size (5 air changes per hour): | 373 sq. ft. (35 m²) |
| Dimensions: | 10.8L x 10.8W x 20.5H inches (27.4L x 27.4W x 52H cm) |
| Weight: | 11.2 lbs (5 kg) |
| Filter lifespan: | 6 months |
| Noise level in decibels from 3 ft. away: | Sleep mode: 35.5 dBA Speed 1: 38.3 dBA Speed 2: 43.2 dBA Speed 3: 51.2 dBA Speed 4: 60.3 dBA |
| Electricity consumption in watts: | Standby: 0.93 watts Sleep mode: 3.05 watts Speed 1: 5.28 watts Speed 2: 8.51 watts Speed 3: 16.41 watts Speed 4: 39.64 watts |
| Manufacturer’s warranty: | 2 years |
| Country of origin: | United States |
| Country of manufacture: | China |
4. Best for less than $200: AirFanta 3Pro (with HEPA + carbon filters)
Most choices above cost $500+ and while they are still my top options for weed smoke, I also wanted to include an affordable device powered by PC fans.
Use the discount code HOUSEFRESH for 5% off when buying directly from AirFanta.
With a design inspired by the DIY Corsi-Rosenthal box, you will need to assemble the 3Pro yourself, but it’s fairly straightforward: you place a filter on each side on top of a plastic base and secure the cube with a PC fan array on top.
You can choose between particle filters only or particle AND carbon filters. For tackling weed smoke, you will need carbon to remove smell.
AirFanta’s carbon filter is a bonded filter that combines a 15mm thick HEPA E11 filter with a 10mm layer of activated carbon. You will get four of them to fit at each side of the 3Pro.
The 3Pro is one of the fastest air purifiers we have ever tested, and you can buy it for less than $200 – that’s outstanding value for money.
Based on this result, we estimate a PM1 CADR of 353 cfm when running at top speed. It’s powerful enough to clean the air five times per hour in spaces up to 529 sq. ft.
CONS
PROS
| Clean air delivery rate (CADR): | – Top speed PM1 CADR: 353 cfm – Sub-45 dBA PM1 CADR: 213 cfm |
| Filter technology: | True HEPA H11 and optional pelleted activated carbon |
| Recommended room size: | 529 sq. ft. (5 air changes per hour) |
| Dimensions: | 12.6D x 12.6W x 12.6H inches (32D x 32W X 32H cm) |
| Weight: | 7.7 lbs (3.49 kg) |
| Noise level in decibels from 3 ft. away: | 3.63 volts: 36.1 dB 4.19 volts: 36.9 dB 5.24 volts: 39.7 dB 6.54 volts: 43.3 dB 7.44 volts: 46.7 dB 8.56 volts: 49.1 dB 12.6 volts: 56.3 dB |
| Electricity consumption in watts : | 43.23 watts |
| Filter lifespan: | 6 – 12 months |
| Manufacturer’s warranty: | 1 year |
| Country of origin: | China |
| Country of manufacture: | China |
Three other good air purifiers for weed smoke
The four air purifiers above are my top picks for weed smoke, but these are other units with solid performance that nearly made the list.
Dyson Big+Quiet BP06
In our tests, the Dyson BP06 showed excellent VOC removal power, completing the test in fourth place after the AC Infinity, the Austin Air and the Alen 75i – – not bad!
It didn’t make the list because the filter lifespan is very short when dealing with high concentrations of VOCs like weed smoke. But if you have money to spend, then this is a good option as it also offers a PM1 CADR of 198 cfm. ➜ READ OUR FULL REVIEW
Levoit EverestAir
The EverestAir comes with a ton of bells and whistles. It has an auto-mode that will kick in within seconds of detecting weed smoke and also offers full app support with the VeSync app.
In our VOC removal tests, it ranked 5th right after the Dyson BP06 (above). This makes it a good option under $500 but the carbon in the filters will be depleted within months if you’re dealing with high levels of weed smoke. ➜ READ OUR FULL REVIEW
Coway Airmega Prox
The ProX is the one of our most recommended air purifiers for large spaces. It offers excellent air cleaning performance (PM1 CADR of 462 cfm), comes with particle and odor filtration, and has smart functions + an on-board laser sensor with real-time particle readings on screen.
It didn’t make the list because it ranked 6th in our VOC removal tests but it costs more than the Alen 75i, which had a better result. ➜ READ OUR FULL REVIEW
Wrapping up
If you’ve reached this point in the guide and are still unsure which air purifier to get, just email Danny at danny@housefresh.com, and he will help you.
And if you want to compare the air purifiers I shortlisted here side-by-side, you can use our comparison tools or play with the interactive tool below:
August 26th, 2026:
- Replaced the Austin Air HealthMate with the AC Infinity CLOUDLINE S8 fan with an 8-inch refillable carbon filter.
- Replaced all models in the ‘Special mentions’ section based on the latest VOC removal results.
May 28th, 2026:
- Replaced the IQAir HealthPro Plus with the Alen BreatheSmart 75i. After testing the V2 of the 75i, I found it offers more powerful particle and gas filtration.
- Replaced the Winix 5500-2 with the Levoit Core 400S because the 5500-2 has been discontinued in the U.S. and Canada.
June 22nd, 2025:
- Added the PC fan-powered AirFanta 3Pro to the list.
- Moved the Alen 45i and the EverestAir outside of the main ranking to a new section with other good options that didn’t make it as top picks.
October 4th, 2024:
- Updated the layout of the article to incorporate a list of air purifiers we don’t recommend for weed smoke.
May 29th, 2024:
- Added a new reader question to the FAQ section of the guide.
May 16th, 2024:
- Updated the introduction and removed a few broken links.
- Added more detail to each of the top picks, focusing mainly on the activated carbon filters.
January 29th, 2024:
- We rolled out a new design for the site, so we had to make lots of adjustments to the layout of this page to fit with the new design elements.
January 10th, 2024:
- Updated the list of units, based on our data from tests we conducted in 2023. The Levoit EverestAir entered the ranking.
