Social media users are sharing a surprisingly effective way to protect yourself indoors from the toxic wildfire smoke blanketing much of the East Coast: a box fan, four air filters and a whole lot of duct tape.
As searches for "air purifiers" spike on Google, people are posting on TikTok and Facebook about how to build the DIY air purifier. The technique, known as the Corsi-Rosenthal method, has gained attention in recent years amid the pandemic and raging western U.S. wildfires.
Some East Coast residents are learning about the box fan method for the first time, unlike their West Coast counterparts who are accustomed to wildfire smoke.
Seattle resident Angel Robertson, 34, posted a video on a New Yorker's TikTok demonstrating how to put it together. In her video, which has amassed more than 600,000 views, Robertson duct tapes four 20-by-20 air filters into a box shape and attaches the fan on top. The whole apparatus costs under US$100.
"It works extremely well and will save your life with really smoky days," she says in the video. "It does a lot better than the normal air filters."
Public health experts say Corsi-Rosenthal purifiers are highly effective at removing particles from the air. Petri Kalliom鈹溍眐i, a postdoctoral researcher at the University of Maryland's School of Public Health, said their clean air delivery rate is relatively high and can be used to purify air against not only smoke, but pollen and viruses.
At the University of Connecticut Thursday, Misti Levy Zamora, an assistant professor in public health sciences, and her colleagues were handing out Corsi-Rosenthal purifiers for free to anyone stopping by. Zamora said she has done several tests at the university, public schools and her own home on the purifier.
"I can confidently say this thing is working really well today," she said. "I was able to filter out all the particles in the air basically back down to what I saw last week within a matter of minutes."
The power of social media led to the invention of the box, co-inventor Richard Corsi, dean of the College of Engineering at the University of California at Davis, told The Associated Press. He said in 2020, he was sketching one night and put the design up on Twitter. Jim Rosenthal, CEO of Tex-Air Filters, took the design and built it. Corsi said he wanted to create an inexpensive purifier that the average American could afford. He's now hearing from friends in the Northeast who are using his idea.
"When you have to seal up a building and reduce the amount of air flow coming in and when you have to spend a lot of time indoors, this is where portable air cleaners can really make a difference in your life," he said.
Grace Turner, 31, built her box fan purifier for her home in Rochester, New York, after picking up the trick from living in Salt Lake City. She shared her DIY box on TikTok where she said the air purifier has made a difference in her home.
"There are a bunch of different designs people can choose from, and it's really accessible to find the info," she said of the DIY instructions online.
Liz Hradil, 27, who lives in Syracuse, New York, said the smoke burned her eyes, and she could feel the smoke in her nose and throat as the smoke descended onto New York this week. She went digging around online to buy an air purifier when she came across the Corsi-Rosenthal box and went to Lowe's to pick up the filters and fan. She then immediately noticed that the smoke smell was gone after about 30 minutes of starting her purifier.
"It was my first time, and my New York friends were like this is so genius," she said after sharing the photo of the box online. "No one had heard of it."
A new round of airstrikes hit Beirut suburbs late Sunday as Israel intensified its bombardment of northern Gaza and southern Lebanon in a widening war with Iran-allied militant groups across the region. Palestinian officials said a strike on a mosque in Gaza killed at least 19 people.
A unique form of clouds made an appearance over the skies of Ottawa on Sunday evening.
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Weeneebayko Area Health Authority and the Government of Ontario have awarded a $1.8 billion fixed-price contract to design, build and finance a new Far North hospital.
The people of Fort Chipewyan believe the federal government knew its water was contaminated and hid the issue for years. Now the chief of the Athabasca Chipewyan First Nation is leading the call for immediate action.
Christopher Ciccone, a multihyphenate artist, dancer, designer and younger brother of Madonna, has died. He was 63.
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The Archbishop of Toronto is among 21 new cardinals Pope Francis named Sunday and the lone new cardinal from North America.
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In a display of strength and perseverance, a Cambridge, Ont. resident has completed a unique aquatic challenge.
Some Manitobans are cleaning up Sunday morning, after intense winds barreled through southern parts of the province Saturday.
A gargantuan gourd 鈥 affectionately named 鈥極rangina鈥 by the urban gardeners who grew it in the front yard of their Vancouver home 鈥 earned the massive honour of being named B.C.鈥檚 heaviest giant pumpkin Saturday.
A new round of airstrikes hit Beirut suburbs late Sunday as Israel intensified its bombardment of northern Gaza and southern Lebanon in a widening war with Iran-allied militant groups across the region. Palestinian officials said a strike on a mosque in Gaza killed at least 19 people.
Advocacy groups behind a so-called suicide capsule said Sunday they have suspended the process of taking applications to use it as a criminal investigation into its first use in Switzerland is completed.
Donald Trump's fourth scheduled stop in eight days in Wisconsin is a sign of his increased attention as Republicans fret about the former president's ability to match the Democrats' enthusiasm and turnout machine.
British Prime Minister Keir Starmer's chief of staff quit on Sunday, citing concerns that growing news reports about her role 'risked becoming a distraction to the government.'
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It was a year ago when Jomana Siddiqui visited Lebanon, where her father was born 鈥 and is now buried. She planned to return there soon; this time, she thought, she would take her two teenage daughters.
Justin Trudeau will travel to Laos later this week for the ASEAN summit, marking what his office says will be the first official visit of a Canadian prime minister to the Southeast Asian country.
In an interview with CTV鈥檚 Question Period host Vassy Kapelos, airing Sunday, Cohen said that despite the failed attempt at a pause, he still believes a ceasefire is possible.
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Rwandan health authorities will begin a vaccine study against the Marburg hemorrhagic fever, officials said Sunday, as the East African country tries to stop the spread of an outbreak that has killed 12 people.
Bruzzese came down with COVID-19 in February 2023, and received her injection at the end of March. 鈥淏eing able to recognize smells is something we take for granted, until you can鈥檛.鈥
New data raises questions about the drinks people consume and the potential risks associated with them, according to researchers at Galway University in Ireland, in partnership with Hamilton鈥檚 McMaster University.
Scientists announced on Thursday a milestone in neurobiological research with the mapping of the entire brain of an adult fruit fly, a feat that may provide insight into brains across the animal kingdom, including people.
For humans, flashing a smile is an easy way to avoid misunderstanding. And, according to a new study, bottlenose dolphins may use a similar tactic while playing with each other.
Alphabet's Google is testing showing check marks next to certain companies on its search results, a company spokesperson said on Friday, in a move aimed at helping users identify verified sources and steer clear of fake websites.
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Dubai's Emirates airline has banned pagers and walkie-talkies from its planes, following last month's attacks on such devices carried by the Lebanese militant group Hezbollah.
'Eat more vegetables,' doctors and dietitians say over and over. But for many people, it鈥檚 hard to do, because they aren鈥檛 excited about veggies or just don鈥檛 like them.
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A five-seat sushi counter located inside another restaurant is the latest Vancouver eatery to receive a Michelin star.
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Tesla is recalling more than 27,000 Cybertrucks because the rearview camera image may not activate immediately after shifting into reverse, the fifth recall for the vehicle since it went on sale late last year.
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Bernie Hicks, known as the 鈥楤atman of Amherst,鈥 always wanted to sit in a Batmobile until a kind stranger made it happen.
Bubi鈥檚 Awesome Eats, located on University Ave West took to social media to announce the closure on Friday.
Weeneebayko Area Health Authority and the Government of Ontario have awarded a $1.8 billion fixed-price contract to design, build and finance a new Far North hospital.
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Avry Wortman, 13, scored two touchdowns on Sunday during her team's win in the under 14 Greater Moncton Football Association.
A gargantuan gourd 鈥 affectionately named 鈥極rangina鈥 by the urban gardeners who grew it in the front yard of their Vancouver home 鈥 earned the massive honour of being named B.C.鈥檚 heaviest giant pumpkin Saturday.
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All that was left of a downtown Langley restaurant Sunday was a pile of rubble behind a blue fence, after a massive fire tore through it the morning before.
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A 54-year-old inmate at the Toronto South Detention Centre has been charged in connection with a deadly jail beating late last week that claimed the life of a 69-year-old prisoner.
The Archbishop of Toronto is among 21 new cardinals Pope Francis named Sunday and the lone new cardinal from North America.
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The Carleton Ravens came within a field goal of their first Panda Game victory since 2017, but ultimately came short of breaking the University of Ottawa Gee Gees winning streak on Sunday.
Ontario Provincial Police say a man has died after striking obstacles on the St. Lawrence River while driving a personal watercraft.
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Monday marks one year since the Hamas attack that killed 1,200 Israelis and triggered the ongoing war in Gaza.
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Bernie Hicks, known as the 鈥楤atman of Amherst,鈥 always wanted to sit in a Batmobile until a kind stranger made it happen.
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An annual vintage sale known as 鈥淎rt from the Attic鈥 returned to St. Vital Centre Sunday, with thousands of collectibles and art pieces on display.
For the 52nd week, pro-Palestinian protesters rallied in Winnipeg, calling for peace in the Middle East amid the ongoing Israel-Hamas war.
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Saskatchewan's two major political parties made campaign stops in Moose Jaw Saturday with both promising to invest into the city if elected on Oct. 28.
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A permanent memorial at the site of the 2018 Humboldt Broncos bus crash is about to be a step closer.
The Saskatchewan Roughriders have clinched a playoff spot thanks to a win over the Edmonton Elks.
The Saskatchewan Teachers' Federation hosted a virtual election forum on education Thursday evening, giving candidates in the provincial election a chance to share their thoughts and answer questions on issues teachers find most important.
Weeneebayko Area Health Authority and the Government of Ontario have awarded a $1.8 billion fixed-price contract to design, build and finance a new Far North hospital.
According to a survey on recent alcohol consumption, younger Canadians are more likely to have not had a drink in the past week. For those interested in slowing or stopping their alcohol consumption, there's a phrase: 'sober curious.'
Hundreds of people are gathering today in cities across Canada to remember the victims of Hamas's Oct. 7 attack on Israel and the hostages that have still not yet made it home.
Tears were shed and emotions ran high at the 33rd annual CIBC Run for the Cure in downtown London, Ont. on Sunday.
The London Knights continue to get players back from NHL training camps but while the roster takes shape, wins have been tough to come by in the early season.
People across Florida were given notice Sunday that Hurricane Milton is intensifying rapidly and will likely be a major hurricane before slamming midweek into the storm-ravaged Gulf Coast.
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Police in Barrie allegedly seized a semi-automatic pistol and drugs during an overnight investigation that resulted in the arrest of three men downtown.
Lakehead University's Orillia Campus hosted the 2024 NASA Space Apps challenge this weekend, which allowed teams of students, mentors and scientists to brainstorm solutions for global issues using real-world NASA data.
This morning just before 7:00 a.m., OPP responded to a collision in which a vehicle struck a pedestrian on the roadway.
The event serves as a pivotal platform for open-class boxers from across Ontario to compete for provincial titles and the opportunity to advance to the Canadian National Championships.
Bubi鈥檚 Awesome Eats, located on University Ave West took to social media to announce the closure on Friday.
NDP Leader David Eby promised Sunday to support police in British Columbia to keep illegal guns off the streets and protect communities, but accused B.C. Conservative Leader John Rustad of planning to make the province less safe.
The calculus of predicting an election and identifying its key battlegrounds is complex enough in any race, but observers of the British Columbia poll this month are facing a pair of unknown quantities that make the math even more confounding.
Police on Vancouver Island have made an arrest in the case of a 78-year-old woman found dead in her home almost two years ago.
Nearly two years after a man was stabbed to death in downtown Kelowna, RCMP have made an arrest in the case.
NDP Leader David Eby is promising to offer a $75-million loan forgiveness program to entice doctors, nurses and heath professionals to expand health-care services in rural British Columbia.
Three young suspects have been arrested in connection with a swarming attack on a teenager in B.C.'s Okanagan last week 鈥 and authorities have asked the public to stop circulating disturbing videos of the incident.
While the summer may be over, construction season in Lethbridge is not.
Lethbridge police executed dozens of warrants and laid numerous charges in another targeted enforcement project in the downtown area.
A person was airlifted to hospital following a serious crash in Taber, Alta., on Friday morning. Taber RCMP responded to the scene on Highway 864 around 10:30 a.m., for a crash involving an SUV and a semi-truck.
As part of an ongoing investigation, provincial police are seeking the public鈥檚 assistance in locating a Kubota tractor stolen in North Shore Township, Ont., last month.
A 33-year-old man was arrested Saturday for allegedly spraying bear mace at three individuals in northwestern Ontario.
A drug raid on a home on the Far North Attawapiskat First Nation last week resulted in two local residents being charged and more than $50,000 in suspected narcotics, including methamphetamine, being seized.
He may not have logged the fastest time or even gone the full distance, but residents of a Newfoundland town agree the goat who unexpectedly joined the local weekend half marathon was the event's undisputed champion.
A mother in a community where the cost of living is one of the highest in the country says grocery prices are 'inhumane' and retailers are putting profits ahead of people鈥檚 basic human right to food.
A soccer game in England on Tuesday night drove a spike in online traffic across the Atlantic to a website launched by the Newfoundland and Labrador government.
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