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I Tried an Air Purifier Designed to Filter Out Weed and Cigarette Smoke

Just because you celebrate 420 doesn’t mean you want the smell of smoke. A new specialty filter from GermGuardian helps keep things fresh.

In the US and globally, April 20 has become an unofficial holiday for weed smokers. While vaping, gummies and edibles are increasingly popular, a fair number of people still light up for a smoke, and that can result in a lingering odor many find unpleasant.

I’m one of those people, and GermGuardian’s new FLT420B air purifier filter is designed to remove cannabis smoke more effectively than standard air purifier filters.
“As cannabis use becomes more widely accepted, we recognized a real gap in the market for a filter purpose-built to tackle cannabis smoke odors, not just mask them,” said Rukky Ojakovo, senior director of heaters and air quality at Guardian Technologies. “In our two-week in-home test, over 90% of users rated it very effective at reducing cannabis odor.”

I’ve been using the FLT420B filter in my home with a GermGuardian AC4880B air purifier for several weeks now, and I’ve been impressed with just how effectively it tackles smoke odors. In my case, the odor is more from cigarette smoke than marijuana (I had the misfortune of indoor smokers moving into the unit below me). The FLT420B filter has been effective at tackling the smell.

“While the FLT420B was engineered specifically for cannabis smoke, its advanced odor-control media targets VOCs [volatile organic compounds] broadly, making it effective against other herbal smoke as well,” Ojakovo told me over email.

According to GermGuardian, the filter is 300 times more effective than standard HEPA smoke filters and targets odor-causing VOCs at the “molecular” level. The company says it can remove cannabis odor within 90 minutes. Though I’m not a marijuana smoker myself — I’m very sensitive to bad odors, and I have two asthmatic cats — I’m planning on testing this soon by using cannabis-scented incense sticks.

In the meantime, to test this, I placed the entire AC4880B air purifier unit, with the smoke filter installed, in a closet in my wife’s office and shut the door. Using the UV-C sanitizing light, which can generate a small amount of safe ozone, the entire closet was effectively deodorized in about 24 hours.

I asked Ojakovo what played the largest role in clearing the odor from the closet. The filter was the primary driver. 

“The FLT420B’s advanced odor-control media is specifically designed to capture VOCs and lingering odors like cigarette smoke,” Ojakovo said. “The UV-C light is great for reducing airborne bacteria, germs, and mold spores, but is less targeted toward chemical-based smoke odors specifically.”     

Interestingly, even after I pulled it out of the closet, the air inside has stayed deodorized, though sealing gaps and cracks likely helped.

To further test how well the filter cleared smells, I moved the GermGuardian unit to my galley kitchen and placed it by my trash cans. There’s not much ventilation in there, and I have a gas range, so there are plenty of VOCs. I’ve left it there for over a week now, and since then, I’ve noticed a distinct reduction in stale cooking smells and a general improvement in air quality, verified by an air quality monitor. 

“Since the FLT420B is designed to tackle VOCs, it can certainly help with cooking-related odors and gases,” said Ojakovo, while also pointing out that the company sells filters designed for kitchen use specifically. “For heavier kitchen use near a gas range, we’d recommend exploring our broader lineup of filters, designed for specific use cases.” 

Now, if you suffer from allergies, you may want to consider a different air purifier model, but for VOCs, it’s been one of the more effective ones I’ve used. 

Price and availability

The FLT420B will work with GermGuardian’s most widely used air purifiers, including the AC4880, AC4825E, AC4300, AC4825, AC4870, AC4820, AC4900, AC4850PT, CDAP4500 and AP2200CA. If you own one of those models, it’s simply a matter of purchasing the FLT420B filter from Amazon (currently out of stock) or directly from Guardian Technologies for $40. 

If you’re a new customer, you can buy the model with the features you prefer and pair it with a filter that suits your use case. 


Editor’s note: While cannabis has been legalized for medical and even recreational use in some states, marijuana and products containing THC are still a Schedule I drug under US federal law. Always exercise caution and judgment when consuming cannabis or any other controlled substance.

Technologies

Anthropic warns investors of AI’s ‘existential risk to humanity’ in IPO prospectus, reports say

Anthropic’s IPO filing dedicates 80 pages to the risks of AI, nearly double the 48 pages it spends discussing its business plans, according to Reuters.

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U.S., Iran hold separate mediator talks as Mideast oil exports hit war-time high

Iranian and U.S. officials reportedly met separately with mediators Monday to push for a ceasefire, as Middle Eastern crude exports rebounded to war-time high.

Iranian and U.S. officials reportedly met separately with mediators Monday to push for a ceasefire.

Middle Eastern crude exports rebounded this month to around their highest level since the war began in February.

An outright export ban by Washington on diesel would keep roughly 1.2 million barrels a day at home, and risks overwhelming Gulf Coast storage, according to Kpler.

The building of the destroyed Shajareh Tayebeh primary school is pictured surrounded by rubble in Minab in Iran’s Hormozgan province on August 10, 2026. Six months on, a team of AFP journalists obtained rare access to the school which has remained largely in ruins, its collapsed walls and twisted steel now surrounded by portraits of the children killed as Iranian flags flutter above the rubble. Iran says the attack on the school involved two separate US Tomahawk missiles but neither the United States nor Israel has officially claimed responsibility for the strike. (Photo by ATTA KENARE / AFP via Getty Images) /

Atta Kenare | Afp | Getty Images

U.S. and Iranian officials have reportedly held separate indirect talks with mediators on Monday, reviving efforts to end seven months of war as Tehran presses for a response to a revised ceasefire framework and Middle East crude exports climb to their highest level since the conflict began.

Iranian Foreign Minister Abbas Araghchi met Qatari mediators in New York, where he remained after the United Nations General Assembly, and reportedly said he expects Washington’s reply by Tuesday. “We talked about ideas and how to find solutions to fulfil Iran’s conditions,” Araghchi said, adding that he planned to return to Tehran once a response arrives. “Whenever the Qataris have a response, they know how to get it to us.”

Iran’s proposal, first presented on the sidelines of last week’s General Assembly, calls for a four- to five-day U.S. timeline to release frozen Iranian funds, lift sanctions on Iranian oil and end the naval blockade of Iranian ports, with nuclear talks beginning within seven days. Tehran has tied any reopening of the Strait of Hormuz to those steps.

President Donald Trump had on Sunday called the plan “unacceptable” and rejected it, telling reporters Iran wants a swift deal because of the economic pressure it is under. Speaking at the White House Monday, Trump said U.S. officials had spoken separately with mediators but gave no further details, adding: “We’re going to win. It’s going to go pretty quickly.”

The diplomatic push comes as physical supply data shows the war’s toll on the oil market easing. Middle Eastern crude exports rebounded this month to around their highest level since the war began in February, Kpler data showed. “Middle East crude exports at just under 80% of pre-conflict levels,” the tracking firm said in a note on Monday.

The Strait of Hormuz itself remains far from normal. Kpler’s real-time tracking showed total clearance through the strait at 10,591 kilobarrels a day on Saturday, against a pre-war baseline of 17,133.

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Technologies

Oil prices fall as crude exports recover at Saudi Arabia’s Red Sea ports

Saudi Arabia has restored flows through the pipeline to around 3.5 million barrels per day, according to media reports.

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