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Corsi-Rosenthal box: How a DIY filter can help with wildfire smoke

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NEW YORK –

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.

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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├ñki, 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.”

 

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India’s media – captured and censored

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Across almost every form of media in India – social, broadcast and print – Narendra Modi and the BJP hold sway.

With India amid a national election campaign, its news media is in sharp focus. Until recently it was believed that the sheer diversity of outlets ensured a range of perspectives, but now, India’s mainstream media has largely been co-opted by the Bharatiya Janata Party and Prime Minister Narendra Modi. Just how did the media in India get to this point and what does it mean for the upcoming elections?

Featuring:

Ravish Kumar – Former Host, NDTV
Shashi Shekhar Vempati – Former CEO, Prasar Bharati
Pramod Raman – Chief Editor, MediaOne
Amy Kazmin – Former South Asia Bureau Chief, Financial Times
Meena Kotwal – Founder, The Mooknayak

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Social media lawsuit launched by Ontario school boards

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Premier Doug Ford says that lawsuits launched by four Ontario school boards against multiple social media platforms are “nonsense” and risk becoming a distraction to the work that really matters.

The school boards, including three in the Greater Toronto Area, have launched lawsuits seeking $4.5 billion in damages against Snapchat, TikTok, and Meta, the owner of both Facebook and Instagram, for creating products that they allege negligently interfere with student learning and have caused “widespread disruption to the education system.”

But at an unrelated news conference in Ottawa on Friday, Ford said that he “disagrees” with the legal action and worries it could take the focus away from “the core values of education.”

“Let’s focus on math, reading and writing. That is what we need to do, put all the resources into the kids,” he said. “What are they spending lawyers fees to go after these massive companies that have endless cash to fight this? Let’s focus on the kids, not this other nonsense that they are looking to fight in court.”

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Four separate but similar statements of claim were filed in Ontario’s Superior Court of JusticSocial media lawsuit launched by Ontario school boards pervasive problems such as distraction, social withdrawal, cyberbullying, a rapid escalation of aggression, and mental health challenges,” Colleen Russell-Rawlins, the director of education with the Toronto District School Board, said in a news release issued Thursday.

“It is imperative that we take steps to ensure the well-being of our youth. We are calling for measures to be implemented to mitigate these harms and prioritize the mental health and academic success of our future generation.”

The school boards are represented by Toronto-based law firm Neinstein LLP and the news release states that school boards “will not be responsible for any costs related to the lawsuit unless a successful outcome is reached.”

These lawsuits come as hundreds of school districts in the United States file similar suits.

“A strong education system is the foundation of our society and our community. Social media products and the changes in behaviour, judgement and attention that they cause pose a threat to that system and to the student population our schools serve,” Duncan Embury, the head of litigation at Neinstein LLP, said in the new release.

“We are proud to support our schools and students in this litigation with the goal of holding social media giants accountable and creating meaningful change.”

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Ontario school boards sue social media giants for $4.5B

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Four major Ontario school boards are taking some of the largest social media companies to court over their products, alleging the way they’re designed has negatively rewired the way children think, behave and learn and disrupted the way schools operate.

The public district school boards of Toronto, Peel and Ottawa-Carleton, along with Toronto’s Catholic counterpart, are looking for about $4.5 billion in total damages from Meta Platforms Inc., Snap Inc. and ByteDance Ltd., which operate the platforms Facebook and Instagram, Snapchat and TikTok respectively, according to separate but similar statements of claim filed Wednesday.

“These social media companies … have knowingly created a product that is addictive and marketed to kids,” said Rachel Chernos Lin, the chair of the Toronto District School Board, on CBC Radio’s Metro Morning on Thursday.

“We need them to be held accountable and we need them to create safer products.”

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Social media giants ‘knowingly’ harming children, TDSB chair says in wake of lawsuit

3 hours ago

Duration 5:53

Four of Ontario’s largest school boards, including the Toronto District School Board (TDSB), have launched lawsuits against social media giants behind Meta, Snapchat and TikTok for allegedly causing harm to students. Metro Morning host David Common spoke with TDSB chair Rachel Chernos Lin about the action.

The allegations have yet to be proven in court, and there is no set date for when they will be heard. CBC Toronto has reached out to the companies named for comment.

The school boards, speaking under a new coalition called Schools for Social Media Change, allege students are experiencing an “attention, learning, and mental health crisis” because of “prolific and compulsive use of social media products,” in a news release.

They allege the platforms facilitate and promote cyberbullying, harassment, hate speech and misinformation, and have a part in escalating physical violence and conflicts in schools, according to the statements of claim.

They also argue these apps are “purposefully designed” to deliver harmful content to students dealing with topics such as suicidal ideation, drugs, self-harm, alcohol, eating disorders, hate speech and sex — particularly content encouraging “non-consensual” sexual activity.

Trying to respond to those problems has caused “massive strains” on the boards’ funds, including in additional mental health programming and staff, IT costs and administrative resources, the release says. The boards call on the social media giants to “remediate” the costs to the larger education system and redesign their products to keep students safe.

Lawsuit may be first of its kind in Canada

Hundreds of school boards in the United States, along with some states, have launched similar lawsuits against social media companies.

Last fall, over 30 states accused Meta Platforms Inc. of harming young people’s mental health and contributing to the youth mental health crisis by knowingly designing features on Instagram and Facebook that cause children to be addicted to its platforms.

In an email, a spokesperson for Snap said Snapchat was “intentionally designed to be different from traditional social media.”

“Snapchat opens directly to a camera — rather than a feed of content — and has no traditional public likes or comments. While we will always have more work to do, we feel good about the role Snapchat plays in helping close friends feel connected, happy and prepared as they face the many challenges of adolescence.”

What social media scrolling is doing to kids’ brains

5 months ago

Duration 7:52

With most children and teenagers spending hours a day on a smartphone, CBC’s Christine Birak breaks down what research shows about how using social media is changing kids’ behaviour, if it’s rewiring their brains and what can be done about it.

Neinstein LLP, a Toronto-based firm, is representing the school boards. The boards will not be responsible for any costs related to the suit unless a successful outcome is reached, the release says.

Duncan Embury, a partner and head of litigation at Neinstein, told CBC News the named companies are “mainly responsible” for the social media products that kids use, and share “common” designs or algorithms that lead to “problematic use.”

To his knowledge, this is the first case of its kind in Canada.

“Based on what we’re seeing and what we’re hearing from our educators, I think this is a problem that is pervasive across our system and I wouldn’t be surprised if there [were] more boards that took this step,” said Embury.

Ford ‘disagrees’ with move

At an unrelated news conference on Thursday, Ontario Premier Doug Ford said he “disagrees” with the schools boards’ lawsuits.

“What are they spending on lawyer fees to go after these massive companies that have endless cash to fight this? Let’s focus on the kids, not about this other nonsense that they’re looking to fight in court,” he said.

WATCH | Ford disagrees with school board lawsuits against social media companies:

Ford disagrees with school board lawsuits against social media companies

2 hours ago

Duration 0:41

Ontario Premier Doug Ford responded to news Thursday that four major school boards in the province are suing some of the largest social media companies over alleged harm to young people, saying he disagrees with the boards’ action. “Let’s focus on the kids, not about this other nonsense,” he told reporters.

CBC News spoke to parents with children who attend schools in the Toronto District School Board. While they all agree social media apps are a problem, they differ in what approach they think should be used to regulate them.

“Just take the phones away,” said Gillian Henderson.

“I don’t think we need to sue anybody, that seems like a long, expensive process. Just take away their phones in class and give them back to them when they need them.”

The board has recently moved to develop a policy to limit cellphone use in classrooms, which includes potential phone bans and social media restrictions. It previously said staff had problems enforcing policies stating students should only use phones for educational purposes only.

Two separate pictures of a woman and a man shown together.
Gillian Henderson and Shyon Baumann have children who attend schools in the Toronto District School Board. Henderson thinks schools should take students’ phones away in class, while Baumann says it may be helpful to force tech giants to decrease harm from their apps through the court system. (Paul Smith/CBC)

Shyon Baumann said school boards could use some help in reducing screen time.

“If the school boards can do what they can trying to police it, that would be great. But it would be also great if the app creators did what they could to make the harms decrease,” he said.

“If they’re not going to make voluntary changes, then maybe doing it through the courts is the most effective way.”

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