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๐Ÿ‡จ๐Ÿ‡ฆ CSA Z94.4:25 -- Selection, use, and care of respirators, draft review (comments open June 20, 2025 - Aug 19, 2025)

This Standard sets out requirements for the selection, use, and care of respirators and for the administration of an effective respiratory protection program in the workplace.


publicreview.csa.ca/Home/Detaiโ€ฆ

@maskup

:xplore1900: :aura: :n95:

#CovidIsAirborne

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in reply to trendless

Might be some of the best news we've had in a long long time... Hope it survives.๐Ÿฅณ

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$[x2 We've just released version 2025.4.3 of Sharkey! [size=small](warning: long)[/size]]

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๐Ÿ”— Respirator Types and Use cdc.gov/niosh/ppe/respirators/

@maskup

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๐Ÿ”— Decreases in chimpanzee respiratory disease signs and enteric viral quantity following implementation of anthroponotic disease prevention protocols at a long-term research site sciencedirect.com/science/artiโ€ฆ

Following a fatal outbreak of anthroponotic respiratory disease among chimpanzees at the long-term field site of Ngogo, Kibale National Park, Uganda, research personnel implemented more stringent disease prevention protocols (e.g., use of face masks in the presence of chimpanzees). Furthermore, in response to the COVID-19 pandemic, a 7-day quarantine period prior to any exposure to chimpanzees was implemented for all Ngogo research personnel.

Chimpanzees were observed to cough less frequently following the implementation of more stringent disease prevention protocols compared to the period prior. Coughing frequencies were even lower following the implementation of the quarantine period.


@maskup

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๐Ÿ”— Measurements of Surrogate Respiratory Sessile Droplet pH and Implications for Exhaled Respiratory Aerosol and Airborne Disease Transmission pubs.acs.org/doi/full/10.1021/โ€ฆ

@maskup

#CovidIsAirborne

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Illinois could become the first state in the country to ban mask bans. Hereโ€™s how we created the bill to do it. thesicktimes.org/2025/05/27/ilโ€ฆ

@maskup

#MaskUp

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๐Ÿ”— Minimal Influenza Virus Transmission From Touching Contaminated Floors and Metal Door Levers: Laboratory Study II onlinelibrary.wiley.com/doi/10โ€ฆ

In our previous paper, we demonstrated through a series of experiments that the probability of influenza virus transmission from touching contaminated surfaces of face masks is minimal (Sci Rep 2024, 14, 20211). In the present study, we expanded upon this study by conducting an experimental evaluation of the likelihood of influenza transmission from dried fomites under three specific scenarios... We found that viable viruses were rarely transmitted to fingertips from the above fomites even when the viral loads in the viral fluid contaminating the fomites far exceeded that seen in real life. Consequently, we conclude that the probability of contact transmission of influenza via dried fomites is negligible or minimal under the scenarios studied here.


@maskup

#CovidIsAirborne

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in reply to trendless

That's good news, because cleaning groceries is a pain (every tried to wipe off a loaf of bread?).

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in reply to Another concerned scientist

@ABScientist Though I expect one should make a distinction between "on the groceries" and "in the groceries".

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๐Ÿ”— Hereโ€™s an Inconvenient Truth: Disease Is in the Air thetyee.ca/Culture/2025/05/16/โ€ฆ

We ignored the science of airborne transmission for a century. Carl Zimmer tells us why.


@maskup

#CovidIsAirborne

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1905 aerosol / droplet experiment U.K. parliament

What were the historical reasons for the resistance to recognizing airborne transmission during the COVID-19 pandemic?

doi.org/10.1111/ina.13070

Estimating the population-level effects of nonpharmaceutical interventions when transmission rates of COVID-19 vary by orders of magnitude from one contact to another

openread.academy/paper/readingโ€ฆ

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Hey there @zeroes people! What's the best resources these days for how to put on a Covid-competent event? What's the best resources for why to make an event Covid-competent? #CovidIsNotOver #covid #WearAMask


Why are you taking sarscov2/covid seriously when others like you didn't?

(presumably there are a number of discrete subtypes of people like you and for which there may be many distinct 'whys'; feel free to share any/all of them)

#CovidIsNotOver

@pandemicene @askazero

This entry was edited (5 months ago)

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in reply to trendless

I guess my first reply was flippant. If these conditions hadn't occurred I might be among the majority/nonzeroes:

  • in 2020, had immune compromised people in my life
  • general attitude of "question everything"
  • had the time, energy, desire, capability to spend hours a day reading abstracts and papers
  • so I did
    • read intelligent analysis and expert notes early on (slatestarcodex.com/ comes to mind from ~January 2020) who correctly laid out possibilities
    • read studies and experts early on who presented unequivocal airborne nature (March or April 2020 I think)


  • recognized based on the above that Public Health was NOT following the evidence; pushed back without effect, but this made clear that public messaging was not trustworthy (again, in 2020!)
  • know people who have been terribly hurt by the pandemic
  • kept reading and the evidence has piled up and up and up

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in reply to trendless

Self-employed with Epstein-Barr floating dormant in my bloodstream. Yeah, no.

That said, I know people with severe asthma who stopped masking b/c peer pressure. "Oh you still mask? I should too."

@pandemicene @askazero

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@askazero this person xoxo.zone/@Ashedryden/11430889โ€ฆ seeks advice for reducing risk when hosing an indoor event

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๐Ÿ”— Indoor Air Pollution: Understanding Harmful Substances in the Indoor Air air-fanta.com/blogs/all/undersโ€ฆ

@maskup

#CovidIsAirborne

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๐Ÿ”— NorthBox 6XL review โ€” the only PC fan air purifier made in Canada
An excellent PC fan-powered air purifier developed by North Box Systems, a father and son company based in Ontario housefresh.com/northbox-6xl-reโ€ฆ

@maskup

#CovidIsNotOver #CovidIsAirborne

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goodmenproject.com/featured-coโ€ฆ

Respirators are so effective that United Kingdom research has indicated their use by the public would have dropped the rate of COVID transmission by an estimated factor of 9, compared with 0.6 for surgical masks. A factor of 9 is enough to put SARS-COV-2 into exponential decay, meaning the virus would have been highly suppressed for as long as respirator use continued. The exponential math of viral spread also means that perfect masking compliance would not have been required to achieve suppression.


@maskup :xplore1900:

#CovidIsAirborne #WearARespirator

This entry was edited (5 months ago)

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Yes-but-my-sovereign-rights-etc ๐Ÿคก๐Ÿคก๐Ÿคก๐Ÿคก๐Ÿคก๐Ÿคก๐Ÿคก๐Ÿคก๐Ÿคก

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@violetblue heya! In the recent COVID newsletter, you wrote, โ€œโ€ฆ I donโ€™t see anyone covering the public health developments as a whole picture, rather than fragments.โ€

There is โ€œHealth Security Decodedโ€ by the Johns Hopkins Center for Health Security: centerforhealthsecurity.org/ouโ€ฆ

Apologies if this came from you, and my inbox and I both forgot; felicitations if this is new and useful! Youโ€™re the fuckinโ€™ best, keep on keeping on

@pandemicene #CovidIsNotOver

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๐Ÿ”— Why Masks-Required Concerts Still Sell Out in the Bay Area

โ€œI think most non-COVID-cautious musicians think about COVID precautions only being for the sake of disabled and immunocompromised folks, and donโ€™t realize that these are real issues that the musicians themselves can be impacted by and are all at risk for.โ€


@pandemicene

This entry was edited (6 months ago)

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in reply to trendless

It's a mystery...

"Why Masks-Required Concerts Still Sell Out in the Bay Area"

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"Respirator" means a facemask that seals around the mouth and nose for the purpose of filtering all the air the wearer inhales.

Respirators can be constructed of either:

a) an elastomeric body designed to be reused many times with replaceable electrostatically-charged, glass fibre, charcoal and/or gas filters, straps, etc

b) an electrostatically-charged fabric designed to be disposed of after one or a small number of uses.

Most reusable elastomeric respirators (N95, FFP2, FFP3, P100) have exhalation valves, but some don't.

Most disposable fabric respirators (KN95, KF94, N95, FFP2, FFP3) don't have exhalation valves, but some do.

๐Ÿงต

@maskup

#MaskUp #MaskMeansRespirator #WearARespirator #N95 #P100 #Respie #Elasto #CovidIsAirborne

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๐Ÿ”— Stanford must end its complicity in COVID harms

Itโ€™s unconscionable that Stanford School of Medicine and the Freeman Spogli Institute hosted a conference in October led by architects of the disablement of 100 million people and the preventable deaths of tens of millions more. Itโ€™s even worse that University President Jonathan Levin lent institutional support by volunteering to make the opening remarks. Itโ€™s worse yet that the apparent success of this conference may have influenced President Donald Trump to tap at least two conference participants for top health posts.


@pandemicene

#CovidIsNotOver

This entry was edited (7 months ago)

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in reply to trendless

what an incredible display of maturity and restraint for a college newspaper op-ed discussing a gore-flecked nightmare conference of vultures and hyenas and dung beetles.

Itโ€™s a feat to experience disability and still have this article inside you five years on. Elite academia voice is a trip in an internet of polemics.

and furthermore, lmao at the perhaps unintended pun in โ€œbeing fรชted at Stanford.โ€ Blessed is Nurgleโ€™s garden.

#CovidIsNotOver

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๐Ÿ”— Developing chlorine-based antiseptic by electrolysis pubmed.ncbi.nlm.nih.gov/319055โ€ฆ

> This paper examined the possibility of using hypochlorite water as a chlorine-based antiseptic for handwashing in public buildings and healthcare facilities. The electrolysis method was used, which produces Hypochlorous acid (HOCl) from mixing drinking water with small amounts of sodium hydroxide. Hypochlorous acid is usually produced by blood cells to surround pathogens when the skin is cut and exposed to pathogens. The methods used were based on hydrolysing drinking water at a different salt concentration (from 0 up to saline water 0.9% NaCl) under the different power supply. The results showed that 0.005-0.01% hydrochloride water can be a perfect antiseptic that can kill most bacteria and pathogenies within 12 s. In one prototype set up one liter of the prepared solution needed the only 2 g of NaCl, 12 V and 3 amps' power. However, the pH value should be maintained to be around 5-6. The results also showed that the most efficient way was to produce the solution on-site. However, if stored properly it can be used for 7-10 days after production.

@pandemicene

#HOCl #HOCLowerCaseL

This entry was edited (8 months ago)

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in reply to trendless

I make HOCL a couple of times a week at home (~250-300ppm) and use it for everything including spraying in public washrooms, sanitizing masks, washing produce, cleaning and sanitizing bathrooms, toothbrushes, cat litter boxes, counters, work surfaces. So cheap, too - ยฝtsp salt and water with ยพtsp white vinegar makes 750ml.

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๐Ÿ”— The Long COVID Game helloworlds.ca/the-long-covid-โ€ฆ

> This short (<5min) instructional game can help illustrate the risks of repeated COVID infections and the chance of acquiring Long COVID. It was designed for large groups, such as a classroom of students. The goal is to communicate the benefits of wearing a respirator, such as an N95, to reduce the number of COVID infections and thus the risk of contracting Long COVID.

@pandemicene

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#PlusLife folks: is there a specific point in the cycle when power draw is maxed out (and/or >2.4a)?

@askazero

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in reply to trendless

I suspect that maximum power draw is when the device is activating the heating (it needs to heat up to ~60 degrees celsius internally).

After switching it on (while blinking red), it needs to go up from 20 to 60, so there is some continuous heating. After that, I guess it will pulse the heater to stay at 60.

I didn't measure that, just educated guessing.

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to re-up -- about masking and protection against gaseous chemicals which are deleterious to your airways/lungs, such as might be contained in wildfire smoke ๐Ÿ‘‡

zeroes.ca/@trendless/113227130โ€ฆ

@maskup

#LAFires #LAFires2025 #California #Wildfire #Wildfires #MaskUp #N95 #P100 #OV


To everyone wearing masks as protection against chemicals from the plant on fire in Conyers, GA [edit: or the wildfires in CA]:

Gases permeate particulate filtration. Use organic vapour / charcoal filters or full-on [chlorine] gas cartridges to keep it out of your respiratory system.

Masks work -- but they have to be the right kind of mask.

๐Ÿ”— ctvnews.ca/mobile/world/more-tโ€ฆ

@maskup

#MaskUp #P100


This entry was edited (8 months ago)

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in reply to trendless

This post contains a 3M cheatsheet with most of the filters they offer, what they're designed to filter, and their part numbers: zeroes.ca/@trendless/112215285โ€ฆ

Some of these filters and the elastomeric [reusable] respirators on which they fit can be found at hardware and industrial supply stores.

@maskup

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๐Ÿ”— โ€œIโ€™ve Never Felt So Confusedโ€: A Mixed-Method Study of Managing Family-to-Work Conflict During the Tripledemic link.springer.com/article/10.1โ€ฆ

> This mixed-methods study incorporates online survey data from the January 2023 Alberta Viewpoint Survey (Nโ€‰=โ€‰1196) and interview data collected from May-August 2023 (Nโ€‰=โ€‰23) to study the strategies families and caregivers used during the tripledemic to manage FWC in a time of high uncertainty.

> Caregiving struggles were exacerbated during the fall of 2022 with the circulation of RSV, influenza, and COVID-19

> This mixed-methods study highlights the strategies families and caregivers used during the tripledemic to manage family-to-work conflict (FWC) in a time of high uncertainty

> Parents, especially mothers, were most likely to miss work for extended periods, leading to a greater potential for FWC among these groups

> Caregivers who were able to take advantage of workplace, relationship, and network resources were better able to limit FWC during these uncertain times

@pandemicene

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๐Ÿ‘‡๐Ÿ“ธ๐Ÿคณ
zeroes.ca/@bringbackmasksbc/11โ€ฆ

:GeordiSaysYes: ๐Ÿ˜ท :mastomask:
โœ…

:GeordiSaysNo: ๐Ÿคฟ ๐Ÿ‘บ
โŒ

@maskup

#StillMasking #YallMasking

This entry was edited (9 months ago)

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๐Ÿ”— Digital Download: Request for Covid Accommodation in Health Care Facilities covidsociety.ca/priorities/safโ€ฆ

@maskup

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๐Ÿ‡จ๐Ÿ‡ฆ @maskup

United Canada Inc sale ๐Ÿ‘‡

Kimtech/Kleenguard/KimberlyClark pouch N95 small 50pk (54066)
$80 -- great for little kids / small faces
unitedcanadainc.com/products/kโ€ฆ

3M Aura trifold N95 440pk (9205+)
$275 -- great for adults with average faces
unitedcanadainc.com/collectionโ€ฆ

Free shipping over $99 (before tax)

This entry was edited (9 months ago)

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Sooo buying a PlusLife in CAD is about 2x the price of in euros or USD, instead of 1.4x or 1.5x from the nominal exchange rates. Ouch!

I've emailed and hope the CC-community discount is significant, but would welcome advice or tips for getting it cheaper without needing a trip to the USA or Europe.

[edit: the discount is significant! The discounted price is still a factor higher than the currency-converted discounted price in EUR or USD though.]

@askazero

#Pandemic #PlusLife #askfedi

This entry was edited (9 months ago)

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in reply to datum (n=1)

tbh I would be concerned about trying to bring it across a US Land border. If they search you, they might get, uh, edgy.

But then again this is Canada. You could probably enter the country with a moose literally sitting in the passenger seat.

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๐Ÿ”— Testing and Masking Policies and Hospital-Onset Respiratory Viral Infections jamanetwork.com/journals/jamanโ€ฆ

> stopping universal masking and SARS-CoV-2 testing was associated with a significant increase in hospital-onset respiratory viral infections relative to community infections. Restarting the masking of health care workers was associated with a significant decrease.

> Nosocomial respiratory viral infections remain associated with increased length of stay and higher mortality in hospitalized populations. Our data suggest that masking and testing were 2 potentially effective measures to protect patients who are hospitalized, particularly when community respiratory virus incidence rates were elevated.

@maskup

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The next head of the US NIH ๐Ÿ‘‡

๐Ÿ”— Republican Witness In COVID-19 Misinformation Hearing Has Been Repeatedly Discredited By Courts For Promoting Misinformation krishnamoorthi.house.gov/mediaโ€ฆ

> In an October 2021 ruling that Tennessee Governor Bill Lee's executive order allowing parents to opt their children out of school mask mandates violates federal law, U.S. District Judge Waverly D. Crenshaw wrote that Dr. Bhattacharya "offered opinions regarding the pediatric effects of masks on children, a discipline on which he admitted he was not qualified to speak," adding "his demeanor and tone while testifying suggest that he is advancing a personal agenda. At this stage of the proceedings, the Court is simply unwilling to trust Dr. Bhattacharya." Judge Crenshaw also added that Dr. Bhattacharya's testimony was "troubling" and "problematic." Similarly, a Manitoba Judge found the same month that Dr. Bhattacharya's testimony public health restrictions was contradicted by a range of evidence, including his own sources.

@pandemicene

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Edit: Thank you for helping. ๐Ÿ’š I ordered some of the Moldex masks and looked up some decent medical tape as a backup for my regular FFP3 masks. I'll be practicing at home with the seal to see if it holds for a couple of hours. I'll bring as much proof as I can collect to convince the hospital employees that I'm wearing no metal. Fingers crossed.

----

Asking for help from German speakers or Moldex mask knowledgeable people, please.

I'll need an MRI soon, so I can't use any masks with metal (nosepiece, clips or antimicrobial layer). Someone told me Moldex masks are MRI-proof, so I've been looking around at their masks and found a German shop where I can order, but I'd like some confirmation. Isn't there any metal on/in the following masks?

industrieware.de/Moldex-Atemscโ€ฆ

industrieware.de/Moldex-FFP2-Nโ€ฆ

industrieware.de/FFP-2-NR-D-Atโ€ฆ

industrieware.de/FFP3-Air-Sealโ€ฆ

It would be nice to try them, since I can buy them per 1 piece (I don't want a big box in case they don't fit), there are several sizes, and they ship in time to me.

Have you tried any Moldex masks? Do they give a good fit for you? Any noticeable differences between the several types? They appear kind of big in the pictures.

PS: Readimasks aren't available in the EU, the easimask is sold out in EU stores, or only sold in expensive bulk, or take too much time and money with customs to get imported on short notice. I have a Prescient Breathe mask without metal, but can't get a good seal with it and the hospital most likely won't allow any elastomeric respirators and the likes, so it's really a total last resort to depend on one of those.

I could still use the FFP3 mask I normally use and remove the metal nosepiece, then try to seal it with medical tape. But the seal might not stay perfect throughout the process either.

#diemaskebleibtauf #MaskUp #covid #CovidIsNotOver #covid19 #SARScov2 #WearAMask

@maskup

This entry was edited (9 months ago)

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in reply to Begrudging Recluse

Hi, masks 1, 2 and 4 are not explicit about their materials, unfortunately.

This one has a data sheet at the bottom though: industrieware.de/FFP-2-NR-D-Atโ€ฆ

Materials of that one are polypropylene, ethylene vinyl acetate and natural rubber

Maybe you can google the mask's names + datenblatt, should net you more info

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in reply to Rianq

Found a data sheet for the complete smart series. Materials seem to be non-metal moldex-europe.com/fileadmin/usโ€ฆ

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in reply to Rianq

The Air series also contains no metals, it's all polyethylene, EVA, polyester, lycra and rubber. Seems like you have freedom of choice, good luck with your MRI!
This entry was edited (9 months ago)

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If you've been infected with sarscov2, after your acute symptoms resolved do you have chronic symptoms and/or hyperlipidemia (HL)?

@askazero @longcovid

  • chronic symptoms, tests show HL (14%, 4 votes)
  • chronic symptoms, suspect HL (0%, 0 votes)
  • chronic symptoms, tests show *no* HL (11%, 3 votes)
  • chronic symptoms, haven't considered HL (44%, 12 votes)
  • no symptoms, tests show HL (0%, 0 votes)
  • no symptoms, tests show *no* HL (7%, 2 votes)
  • no symptoms, haven't considered HL (22%, 6 votes)
27 voters. Poll end: 9 months ago

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in reply to trendless

Symptoms, already had HL so I didnโ€™t know what to choose here

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in reply to trendless

My father in law was extremely fit and healthy, worked outside for 25 years. Very good shape.

He had a very bad Round 2 w/ Covid in 2021. chest pain, etc. Was 67.

Tests showed crazy high lipids, etc.

He had a massive heart attack, was clinically dead for 15 minutes in 2022, and now has a stent as well as irreparable damage to the "widow maker" artery. We wait for the phone call any day.

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Looks like there's a discount code that brings the price of an ElastoMaskPro down from $70 to $30 (๐Ÿ‡บ๐Ÿ‡ธ) -- basically getting a free mask for the price of the filters.

reusable-respirators.com/produโ€ฆ

A couple years ago, they sent me one to check out. Though it never became part of my regular rotation, it has some good (and not-so-good) features -- it's comfortable, breathable, and svelt, but employs thin, non-adjustable/replaceable straps.

Even with NIOSH N95 certification and filters that last a year, $70 is way too pricey imo (never mind $129, Flo). At $30, though and especially if you haven't been able to find a P100 you're comfortable wearing, it might just be worth a look.

breathesafeair.com/elastomaskpโ€ฆ

reddit.com/r/MasksForEveryone/โ€ฆ

m.youtube.com/watch?v=hWIVMKfEโ€ฆ

@maskup

This entry was edited (9 months ago)

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in reply to trendless

the design feature I like is the way the filters are protected from external things.
Also the fact that when you remove the filter pucks, the corpus can just be dunked in soapy water.

What I don't like: the price of the filter pucks, the fact that replacing one of the straps (should they tear) seems impossible.

@maskup

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in reply to fritzoids

@fritzoids yes indeed. Gerard mentions it comes with a 1yr warranty, though who knows how they'd handle strap breakage ๐Ÿค”

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A remote long covid clinic -- yeah, there's probably no interest in or need for something like that, right? Better just mothball it. ๐Ÿ™ƒ

๐Ÿ”— Alberta had a long COVID program that never saw the light of day fitzhugh.ca/local-news/the-stoโ€ฆ

> Tools for remotely assessing fatigue and breathlessness were designed, developed, and then shelved before clinical implementation.

@pandemicene

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๐Ÿ”— How school eligibility influences the spread of infectious diseases medicalxpress.com/news/2024-11โ€ฆ

> Researchers analyzed the natural age cutoff for kindergarten eligibility in California to compare COVID-19 rates between children old enough to start school and those who were not.

> The study's findings underscore the complexity of school-based transmission and highlight the effectiveness of school-based prevention measures.

@pandemicene

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in reply to trendless

And last for YEARS...
A disposable face mask stuck in a tree that will be there till the tree dies.

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โ‡ง