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David Elfstrom 🍁

@davidelfstrom.bsky.social
11K followers 1.5K following 3.6K posts

P.Eng, Energy management, measurement & verification. Toronto, Canada. Born 327ppm CO2. Climate Action & electrification; Safer infrastructure; cycling; air filtration & ventilation

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Reposted by David Elfstrom 🍁
Mark Ungrin @mark-ungrin.bsky.social · 28/09/2026
An absolutely damning report on the unnecessary COVID deaths of workers at the Cargill plant in High River, AB, highlighting public health and infection control's mismanagement of the crisis, and failure to engage OHS or follow the precautionary principle. albertapolitics.ca/wp-content/u...
As the evidence marshalled in this report shows, the massive
outbreak associated with Cargill was by no means inevitable. It
occurred because systems designed to protect worker health and
safety failed. And they failed for a number of interrelated reasons.
OHS and AHS Did Not Adopt the
Precautionary Principle
The virus SARS-CoV-2 is spread among humans via aerosol
transmission. The period during which someone with COVID-19
can transmit the virus varies depending on factors such as the
variant and severity of illness, but transmission can occur both
before and after symptom onset. Some infected individuals never
experience illness but still spread the virus to others.
At the beginning of the pandemic, Hinshaw and many other
public health leaders believed that COVID-19 only spread via
large droplets and that asymptomatic transmission was not
occurring. As a result, AHS EPH primarily focused on physical
barriers, physical distancing, hand-washing, and surgical masks as
preventative measures at Cargill.Cargill, AHS, and OHS did not consider the possible range of
aerosol transmission of the virus in a large crowded industrial
work setting and, therefore, did not prioritize — let alone consider
— higher-level control measures such as improved ventilation, air
filtration, and N95 (or equivalent) respirators.
Surgical masks, which were made mandatory at Cargill after April
16, provided inferior protection to workers working eight hours a
day, especially for those working in close quarters with inadequate
ventilation. Sometime between the closure of the facility (April
22) and its reopening (May 4), Alberta OHS came to believe that
tight-fitting, higher-filtration respirators (N95 or equivalent
masks) were required, as demonstrated by the ministerial order
approving KN95 masks (May 3) and OHS officers’ decision to wear
N95 masks during their May 4 inspection. However, the evidence
suggests that this view was not shared by Hinshaw.
Ventilation was not identified as a potential factor in the spread
at Cargill until early May, and even then, there is no evidence that
this pathway was further investigated by AHS or OHS.
Had OHS, AHS, and Cargill adopted the precautionary principle,
which requires taking proactive measures to maximize human
safety before the science about the transmission of a new virus
is known, more aggressive control measures would have been
adopted early on. If improved ventilation, provision of N95 masks
(or cartridge respirators), and other actions had been taken earlier,
hundreds of workers may have been spared from illness.None of the evidence we reviewed showed any communication
or coordination between AHS EPH officials and Alberta OHS at
this time. In response to our freedom of information requests for
email correspondence between the manager for OHS in Calgary
and several AHS officials who were directly involved in the Cargill
response, we were informed by the Government of Alberta’s
access to information that “a thorough search […] did not yield any
records responsive to your request.”195
By April 16, the total number of known confirmed positive cases
had reached approximately 550. At this point, there had only
been one in-person inspection of the plant, that being AHS’ April
7 visit, which resulted in non-binding recommendations. And, as
mentioned, there was no epidemiological analysis of the outbreak
showing the temporal pattern of the spread within the plant and
in the community.
An internal AHS MOH update on April 17 noted that “84% of
new COVID-19 cases [in the province] are in Calgary Zone, ‘most
related to Cargill.”196 By this time, a Cargill worker and union shop
steward had been admitted to an ICU. On April 18, another worker
would need life support care in the ICU. Cargill, AHS, and OHS had
lost control of the outbreak.Echoing Cargill’s response to the union’s April 12 letter, Dreeshen
cautioned workers not to listen to “inflammatory rhetoric” and
appealed to them to instead focus on information from public
health experts:
“…On this call are Alberta’s best medical minds and
they provide Alberta’s government with the best up
to date information on a daily basis and I would just
like to encourage everyone to not get distracted by
misleading noise or inflammatory rhetoric because
any government's primary goal — our core goal — is
to keep our people safe…”
Immediately after the town hall, Dreeshen posted on his social
media: “Directly communicated with [Cargill] workers to reassure
them that their worksite is safe.”217 Internal email messages
among senior officials with the Ministry of Agriculture and
Forestry suggest there was also “a request” to share some “key
messages” about the safety of Cargill’s plant through Hinshaw’s
Twitter account.218
Hours after the town hall, Dr. Nick Etches, acting lead medical
officer of health for the Calgary Zone, wrote to colleagues
requesting assistance with an epidemiological analysis of
the outbreak:
“[Hu] just spoke with [Hinshaw] and she wants us
to answer some questions that will likely require
additional epi support. Essentially we want to
determine the proportion of the Cargill-associated
cases that are due to:
1) Workplace transmission
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 28/09/2026
Wow check out the US Treasury yield. That explains why the Canadian dollar has fallen lately too.
US 10 year Treasury yield chart YTD started at 4.25% and is now 5.27% September 28 2026 mid-day
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 23/09/2026
It's that (second) time of the year in Toronto when it makes sense to use as much outdoor air as possible in buildings. At the office. Breathing zone CO2 611 ppm at 10:45 AM
Aranet 4 Home meter on top of a task light reading 611 parts per million of carbon dioxide, 21.8 degrees celsius temperature, 49% relative humidity
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Reposted by David Elfstrom 🍁
Institute of Health Emergencies & Pandemics @uoftpandemics.bsky.social · 22/09/2026
🛡️ As flu season approaches, air filtration remains an important layer of protection against infectious diseases. IHEP member Jeff Siegel @engineering.utoronto.ca) explains how high-efficiency air filtration can help reduce airborne pathogens in shared indoor spaces.
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Reposted by David Elfstrom 🍁
Julie S. Lalonde @julieslalonde.bsky.social · 17/09/2026
There are many, many reasons to feel powerless these days. Everything feels big & scary. But what if you had the confidence to de-escalate situations - even when it's in public with a bunch of strangers? Give me 1 hour of your time & I'll teach it to you for FREE Register: zoom.us/webinar/regi...
Image of a nighttime cityscape with the words "Stand Up! Bystander intervention training to end street harassment. Happening September 22 from 6-7pm EST. Zoom webinar"
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Glendon Mellow @flyingtrilobite.com · 18/09/2026
Welcome to the #TOphoto Feed! Photography of Toronto, Canada. Currently an open Feed: use hashtag #TOPhoto for your work to appear. 🦝 No AI 🦝 SFW, please 🦝 Use Alt text 📸 Let's see your best photos 📸 Tap the 3 dots at top-right to Like and Pin the Feed 📸 bsky.app/profile/flyi...
An early morning photo of the lyrical white and red Cherry Bridge on Cherry Street, from when Biidaasige Park was under construction. The dark blue water is still and an almost perfect reflection of the bridge can be seen. I am not a professional. iPhone 11 Pro.
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George Monbiot @georgemonbiot.bsky.social · 17/09/2026
A macho culture of performative selfishness might start on the roads, through racing, rolling coal, ever bigger SUVs ... But it doesn't end there. If we want to live in a decent country which values human life, we need to change this culture. My column. www.theguardian.com/commentisfre...
theguardian.com
Driving that’s too fast, too dangerous and utterly lawless: why do we tolerate this petro-masculinity? | George Monbiot
In towns and in the countryside, I see 4x4s and pick up trucks driven without care or consicence. It’s a Magafication of transport, says Guardian columnist George Monbiot
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Bean & Sprout's Mom @beansproutsmom.bsky.social · 16/09/2026
The last breath of the aerosol-generating procedure? Scotland's new infection-control guidance and implications for anaesthesia   research-information.bris.ac.uk/en/publicati...
Abstract
In August 2026, Scotland fundamentally changed its infection control guidance regarding how respiratory disease transmission risk is managed - replacing the droplet–airborne dichotomy with the simpler concept of air transmission, and entirely removing the aerosol-generating procedure (AGP) list. This evidence-informed approach is based largely on the findings of clinical aerosol studies undertaken during COVID-19 which demonstrated that many procedures on the existing AGP lists, such as tracheal intubation, generate little or no respiratory aerosol (substantially less than talking or coughing). Removing the AGP list does not mean less protection; it means precautions are based on the likely pathogen, patient's respiratory activity, practitioner exposure and environment. Scotland’s revised guidance offers a timely opportunity to replace the inherited dogmas in international guidelines with rational and evidence-informed respiratory protection before the next respiratory disease pandemic.
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Reposted by David Elfstrom 🍁
Kanchan @kayehm.bsky.social · 16/09/2026
It's not common for Engineers to take a stand on anything (much to my frustration), that's why this statement from OSPE about Bill 212 and the recent court ruling is so important. ospe.on.ca/advocacy/osp...
ospe.on.ca
OSPE Statement: Where Things Stand on Bill 212 and Toronto's Bike Lanes
Explore the OSPE Statement on Bill 212 and its impact on Toronto's bike lanes and transportation planning.
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 15/09/2026
Here's Nene Royal with OZONE performing Welcome to the Jungle by Guns N' Roses when SHE WAS 11 YEARS OLD, and Boon the drummer WAS EIGHT YEARS OLD!
youtube.com
WELCOME TO THE JUNGLE (Guns N' Roses) - Cover by OZONE Kids Band
YouTube video by OZONE Band FC
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Oh The Urbanity! @ohtheurbanity.bsky.social · 14/09/2026
Here’s an angle grinder resistant bike lock on sale at MEC in Canada for $345. This one is on the larger side, good for e-bikes and cargo bikes. Especially ones with larger tubes.
mec.ca
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Reposted by David Elfstrom 🍁
Matt Bors @mattbors.bsky.social · 14/09/2026
It was exactly ten years ago today, on my 33rd birthday, that I posted this comic online.
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 13/09/2026
On this day 8 years ago It's a bulldozed wasteland now.
Ontario Place entrance at night. A 3D steel lattice holding a 3D sculpture of the Ontario Place tri-lobed logo is lit by magenta spotlights against a black sky.
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Serenity Now! @cpo10za.bsky.social · 12/09/2026
Great satirical take on the recent AI employee resignation posts.
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 11/09/2026
As the western provinces move to permanent Daylight Savings Time, there's real safety and health concerns. It should really have been permanent Standard Time. Here's what school facilities need to consider:
reminetwork.com
Dark edge awaits Alberta and B.C. school days - REMI Network
Alberta and B.C. schools days will begin in the dark this fall and winter after the two provinces transition to permanent daylight saving time on Nov. 1
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Reposted by David Elfstrom 🍁
Canadian History Ehx @cdnhistoryehx.bsky.social · 07/09/2026
When a Canadian engineer graduates, they are given an iron ring in a ceremony called The Ritual of the Calling of an Engineer. The tradition dates back a century and includes a connection to Rudyard Kipling and a terrible bridge disaster. This is the story. 📸 TranBC 🧵1/8
Six diverse hands forming a circle with fists touching at the center, each wearing a matching silver ring to symbolize unity and solidarity.
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 07/09/2026
Good article about air cleaner device noise levels (sound pressure vs sound power) by @adamwong.bsky.social
air-fanta.com
The Decibels You Hear May Not Be the Decibels You Think
We often talk about noise in terms of decibels, but few people realize that behind this seemingly simple number lie two entirely different measurement frameworks: sound power level and sound pressure ...
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 07/09/2026
Splendid example of #carchitecture Gibeau Orange Julep in Montreal at dusk as viewed from across its parking lot and 15 lanes of traffic.
View at dusk of a 69-foot tall orange sphere in the background. A car is entering the frame from the left. Two traffic pylons are in front of the car, illuminated by headlights. Bright spotlights illuminate the sphere on its horizontal axis. Taken at GPS 45.496303,-73.655401
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 07/09/2026
Duralast brand tactile metal plates for pedestrians in Montreal are either Made in France (if square) or Made in USA (if curved).
Two adjacent tactile plates of brand Duralast with a slightly rusty appearance. The left one is slightly curved and says Made in USA while the right one of square shape says Made in France.
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 06/09/2026
@ohtheurbanity.bsky.social Any idea why is there a No Pedestrian sign right next to the crosswalk at the bottom of the stairs to Mount Royal?
View looking south down Peel  at the T intersection of Avenue des Pins showing a no walk sign on a lamppost 2.5 m from the crosswalk
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Reposted by David Elfstrom 🍁
Ellie Saurus @elliesaur.bsky.social · 03/09/2026
Reasons to ride a bike: - Bikes are fast and get you places on time - Gives you a nice butt - Most energy efficient way to travel - Get to go whee the whole time - Virtually immune to traffic - The going whee thing, but again
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 03/09/2026
#BikeTO has anyone found the RFP for "restoring motor vehicle lanes" aka bike lane removal on the Ontario Tenders Portal?
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Barry Hunt @barryhunt008.bsky.social · 01/09/2026
Heterogeneity of Airborne Virus Transmission in the Built Environment: A Narrative Review This is the best explainer I've seen wrt the engineering parameters of airborne transmission And a must read for anyone involved in healthcare design 👏👏👏 paijournal.com/index.php/pa...
paijournal.com
Heterogeneity of Airborne Virus Transmission in the Built Environment: A Narrative Review | Pathogens and Immunity
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Jonathan Douglas PhD CPsych @jonathanconp.bsky.social · 30/08/2026
Geri currently has 29 followers. Let’s make it 29,000
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 29/08/2026
How your DM found me this #Caturday morning
Tabby cat on a padded kitchen chair facing backwards with his head poking through a triangular hole. His fur is puffed around the opening.
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 24/08/2026
No cheating. Share the last photo of the sky from your camera roll
Twilight view of the skyline with a rooftop trellis with patio lights over a small table and two chairs. The sky is deep blue at the top fading to a brownish-red  glow at the horizon
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 23/08/2026
Ti Kwan Leep (skit) & Boot To The Head (song) People talking in movie shows People smoking in bed People voting Republican Give them a boot to the head!
youtu.be
The Frantics - Boot to the Head - 16. Ti Kwan Leep
YouTube video by Jay Ess
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 23/08/2026
What a bunch of weirdos. The tariff list contains many oddly specific items. www.cfib-fcei.ca/en/site/us-t...
Canadian Federation of Independent Business (CFIB) 

Are my goods impacted by the new U.S. 50% tariffs coming on August 19, 2026?

Lookup tool:
Enter the HTSUS code or product name to find out whether the products your business sells are included in the list of items subject to the new U.S. 50% tariffs.
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ℳatt @matttomic.bsky.social · 14/08/2026
They brought in Dr. Shoshanna Saxe to testify for the pro-bike lane side. Dr. Saxe has a PhD from Cambridge, is a licensed professional engineer, and associate professor at U of T. The judge basically throws out all of her expert testimony as being the biased, arbitrary opinions of a bike lobbyist
In reaching these conclusions, the application judge relied on evidence proffered by Dr. Shoshanna Saxe, whom he described as an expert on transportation infrastructure, including cycling. Dr. Saxe is a proponent of cycling. Her evidence, and that of the respondents’ experts more generally, was impugned by the appellants on this basis. I accept that Dr. Saxe was not biased in a legal sense but repeat what this court said in Fair Voting BC v. Canada (Attorney General), 2025 ONCA 581, 177 O.R. (3d) 401, at paras. 19-20, leave to appeal refused, [2025] S.C.C.A. No. 384: academic expert evidence – social science research in particular – must be approached by courts with considerable caution. It is often geared towards supporting preferred policy outcomes rather than discovering the objective truth of a matter under investigation. And courts are prone to missing the normative and policy dimensions of issues if they present in purely technical terms, ostensibly resolvable on an objective and uncontroversial basis by technical experts.

[62]       Dr. Saxe clearly favours bicycles. That was clear from the tenor of her evidence, which included the assertion that “investing in cycling infrastructure is one of the most powerful tools available to reduce congestion.” As the application judge noted, Dr. Saxe conceded that the removal of bicycle lanes might provide a benefit in the short term. But she expressed the opinion that, over the medium to long term, removing the bicycle lanes would make traffic congestion worse. She predicted that emergency response “will likely be worse” and that “gridlock becomes a possibility”.
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DCapTO @dcapto.bsky.social · 13/08/2026
Thanks for the heads up @davidelfstrom.bsky.social! I snagged a few 2-pack 20x20 Filtrete 1900 for my Northbox Corsi-Rosenthal-style air purifier They are indeed normally $64.99 at Canadian Tire & Home Hardware, $51.99 at Rona, but today I paid $26.99 per 2-pack 🙌 Just in time for Fall changeup 🌬️🍂🍁
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Kevin Anderson @kevinclimate.bsky.social · 13/08/2026
Long form interview on @novaramedia.com - covering a wide range of climate issues: from the science to the politics, the climate leadership prospects of the new PM and the dangerous soft-pedalling by many climate academics/experts & much of the mainstream media. m.youtube.com/watch?v=mBFo...
m.youtube.com
Ex-Oil Engineer Turned Climate Whistleblower: We Face COLLAPSE | Aaron Bastani Meets Kevin Anderson
YouTube video by Novara Media
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 11/08/2026
Heads up Canadian #crbox builders and PC fan air cleaner enthusiasts – Canadian Tire has a sale on 2-packs of Filtrete 1900 starting Thursday for $26.99 ($13.50 each). Normal price is $64.99, hope they are in stock by then. No rainchecks. @northboxsystems.bsky.social (That's like $9.64 each in USD)
Photo of Canadian Tire advertisement showing 3M Filtrete 1900 filter 2-pack on sale for 26.99 special buy, August 13-20 2026Regular price on CanadianTire.ca of 2-pack Special Buy if Filtrete 1900. 20x20 and 20x25 shown.
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Conor Browne @brownecfm.bsky.social · 09/08/2026
There is a reason why many people you know seem different now. Not quite who they were before. www.psypost.org/brain-scans-...
psypost.org
Brain scans reveal widespread structural and functional changes in patients following COVID-19 infection
A systematic review of 49 imaging studies highlights how COVID-19 affects the human brain. Researchers found widespread structural and functional changes in areas responsible for memory, emotion, and ...
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 08/08/2026
—How about electro-magnetic launch catapults on aircraft carriers? —No, not like that!
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 08/08/2026
Before/after dog grooming
Pre-grooming medium black Labradoodle sitting on a bench with very poofy fur all overPost-grooming medium black Labradoodle sitting on a bench with much skinnier looking legs and smaller paws, clearer face
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 08/08/2026
We had a human vaccine for Lyme disease in the 90's that was 80% effective. It got pulled after attacks by anti-vaccine pushback. But your dog can get one.
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Morgan Fairchild @morgfair.bsky.social · 07/08/2026
#OnMyWalk to see the incomparable Sarah McLachlan at The Greek Theatre with my fabulous friend @galeannehurd.bsky.social who is so kind to include me AND is a fellow masker😷 A great show & a great friend! #BeKind Sending Love To You All💗🌷💗🥳💗🎉💗😷💗🌷💗🥳💗🎉💗😷💗🌷💗🥳💗🎉💗😷💗🌷💗
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Matt Oliver @sameo416.bsky.social · 06/08/2026
www.huffpost.com/entry/violet...
huffpost.com
Violet Affleck Reveals Why She’s Often Seen Wearing A Face Mask In Public
The teen daughter of Jennifer Garner and Ben Affleck opened up about a personal health condition during an impassioned speech.
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David Ho @davidho.bsky.social · 04/08/2026
This might answer your question.
pluginsolarus.com
UL 3700 Explained: The Safety Standard That Makes Plug-In Solar Legal | PlugInSolarUS
UL 3700 is the safety certification every plug-in solar law references. Learn what it covers, why it matters, which systems are certified, and how it differs from UL 1741.
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David Zipper @davidzipper.bsky.social · 04/08/2026
A story of cause and effect: Last November, Ontario banned cities from using speed safety cameras to issue tickets. Reckless speeding immediately surged in Toronto, Ottawa, Guelph, and cities throughout the province. A 🧵 about my latest in Bloomberg (gift link)
bloomberg.com
What Happens When Speed Cameras Get Shut Off
In 2025, Ontario banned automated traffic enforcement. Now the number of drivers exceeding the speed limit has surged, according to traffic data.
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Adam Rawnsley @arawnsley.bsky.social · 04/08/2026
Today, August 4, 2026, is the setting of Ray Bradbury’s short story “There Will Come Soft Rains” about a fully automated house continuing on after the family who lived there and the world around it died in a nuclear blast.
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 03/08/2026
There's a Nathan W. Pyle comic for that
A four-panel comic by Nathan W. Pyle depicts a humorous take on a spoon sliding into a bowl. In the first panel, a smiling, anthropomorphic spoon rests on the rim of a bowl of orange soup, saying, "JUST DOIN' MY JOB READY TO SERVE!" In the second panel, a close-up shows the spoon relaxing into the liquid, noting, "HEY THIS SOUP FEELS SO NICE AND WARM..." By the third panel, the spoon slides lower, leaving only its face visible as it says, "THINK I'LL JUST SLIDE DOWN A BIT". In the final panel, the spoon is almost entirely submerged with only the top of its head peeking out, its final speech bubble cut short with "AW YE-"
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Sphagnum Moss @mosssphagnum.bsky.social · 02/08/2026
Anyone casting doubt on the effectiveness of filtration on the reduction of respiratory diseases ought to have a word with pig farmers because pigs get appropriately sized air filters in crowded spaces porkgateway.org/resource/pri...
porkgateway.org
Principles of Air Filtration for Swine Facilities - Pork Information Gateway
Air filtration is a commonly used biosecurity practice to minimize the spread of airborne diseases. Common airborne diseases include Porcine Reproductive and Respiratory Syndrome Virus (PRRSV), Mycopl...
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 01/08/2026
When we booked our Algonquin backcountry trip I was disappointed because a full moon would make for poor stargazing. Had NO idea the full moon would rise in the east opposite in the sky from the sunset an hour earlier. Absolutely stunning. Photos can't really capture it.
Red full moon rising above a treed hill reflected in the still water of a lake. A boulder is in the foreground at the water's edge.A red full moon rises over a hill reflected in a lake. The rocks in the foreground are illuminated by a flashlightA full red moon rises above a hill behind a lake, reflecting the moonlight. A large boulder is in the foreground.
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 01/08/2026
Reminder to get out and touch moss
Child's hand touching bright green soft moss on a forest floor
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Gil Meslin @gmeslin.bsky.social · 22/07/2026
Attention single-stair/missing middle people: as part of OBC review, the Province has opened a consultation on the Building Code, seeking to “identify ways to reduce unnecessary costs, delays, complexity, and administrative burden”. Runs to August 14. ero.ontario.ca/notice/026-0744
ero.ontario.ca
Consultation on Reducing Regulatory Burden in Ontario's Building Code | Environmental Registry of Ontario
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 21/07/2026
There's still six Tuesdays before August 30. That's six T.A.C.O. Tuesday opportunities.
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 19/07/2026
Unusual failure mode to have a vehicle split in half. Is that intentional, or a consequence of other design choices?
yahoo.com
Cybertruck Split In Half After Moving Truck Slams Into 10 Cars On Highway
A chaotic multi-vehicle pileup in Silver Spring, Maryland left a trail of mangled metal on Saturday afternoon, and one of the more eye-catching casualties was a Tesla Cybertruck that ended up torn cle...
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 18/07/2026
Use PM2.5 µg/m3 metrics to compare. Excellent: Air Quality Ontario www.airqualityontario.com/aqhi/locatio... Very good: QuantAQ - use Desktop mode app.quant-aq.com/map Good: Purple Air - map.purpleair.com/air-quality-... & IQAir www.iqair.com/ca/air-quali...
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David Elfstrom 🍁 @davidelfstrom.bsky.social · 16/07/2026
A Redditor put together some instructions on on how to make an optimized 1-filter air cleaner using a box fan from my experimentation several years ago. It's in a Google drive folder here: drive.google.com/drive/folder...
Post to /r/crboxes by gopher_xyzpdq

Zine: How to build an air purifier for <$75
CR Box Build Guide
I made a zine with instructions on how to build a cheap & effective air purifier (1-fan CR Box). The folder also has a presentation version of the instructions. Link

Materials are just a box fan, the box the fan comes in, & MERV 13 filter held together with tape (design based on optimizations/testing by David Elfstrom).

Share with anyone affected by the wildfire smoke plume or wants cleaner air!Google Drive folder preview with a presentation file, a PDF, and a Document about building a DIY air cleaner
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