ASHRAE publishes recommendations for indoor CO2 concentrations (<700 ppm of outdoor air) but these design targets aren’t measured and regularly fail (example here from a crowded conference room at a hotel I was at recently). What’s the solution? CO2 displays in each room? Alarms? Commissioning?
November 1, 2025 at 5:56 AM
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Houston ASHRAE had a big father/son geeky banquet for the premiere of 2001: A Space Odessey. I don't think we saw Countdown till it was double billed at the drive-in.
October 24, 2025 at 10:27 PM
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Cool. Now how about mandating ASHRAE 241 for all indoor public spaces, starting with heath care settings, schools, and government buildings to reduce the odds of people getting sick in the first place? Or doesn't that sound PR-friendly enough to you, even though it would save lives and reduce misery
October 20, 2025 at 10:55 PM
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Legal vs moral ... and where are the boundaries of engineering🤔
I've been researching as I wrap my head around infection prevention engineering vs public health role.
Given ASHRAE statements and new standard, laws of physics, etc, I feel there is an obligation to tell IPAC to screw off. Yet...
I've been researching as I wrap my head around infection prevention engineering vs public health role.
Given ASHRAE statements and new standard, laws of physics, etc, I feel there is an obligation to tell IPAC to screw off. Yet...
October 17, 2025 at 12:21 AM
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Looking forward to California and the other 14 mandating ASHRAE 241 for indoor public spaces, because if they don't, they aren't following the science (or the engineering), they're following physicians, who aren't scientists and at the median don't have any significant scientific skills.
The American people deserve a public health system that puts science before politics.
That's why California and 14 other governors are joining forces to launch the Governors Public Health Alliance to protect communities and guarantee decisions are rooted in data and health.
That's why California and 14 other governors are joining forces to launch the Governors Public Health Alliance to protect communities and guarantee decisions are rooted in data and health.
October 16, 2025 at 6:24 AM
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They don't meet ASHRAE 241! Well this study pre-dates 241. But 241 looks for the total equivalent ventilation ie all removal mechanisms are additive, ventilation and filtration and bio decay (eg by UV). The average ventilation is 3ach and the average class 250m3 = 208L/s 11/n
October 15, 2025 at 7:33 PM
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Interesting (cc: @pipedreaming.bsky.social). Who at ASHRAE makes that determination?
October 14, 2025 at 2:32 AM
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I work for ASHRAE so that’s who I meant by we. That’s wild. If we think there is like a chance that a comp copy gets an ASHRAE standard used, thats all the incentive we need to give a free copy out.
October 14, 2025 at 2:31 AM
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This is bad. Propane is a legal refrigerant in Europe and Asia. Should be here too. Calling ASHRAE the regulator, is the problem. They’re really an industry org, but government outsourced regulatory and certification standards to it. Right?
The sheer arrogance of these industry regulator bodies who think it's reasonable for them to slow-walk "research" on a technology that's safely and widely used in the rest of the world for an entire decade
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October 13, 2025 at 11:54 PM
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Nice to see @isiaq.bsky.social, ASHRAE, and American Lung Association among those organizations.
Yesterday, history happened at the UN: For the first time hundreds of orgs signed a global pledge declaring that healthy indoor air is a human right.
Healthy indoor air is a key tool for preventing pandemics, building climate resilience, and increasing health equity. We need it everywhere!
Healthy indoor air is a key tool for preventing pandemics, building climate resilience, and increasing health equity. We need it everywhere!
September 25, 2025 at 4:22 PM
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The momentum for clean indoor air continues to build. I attended the inaugural High-Level Side Event on indoor air quality at the UN General Assembly yesterday. Short remarks by Lidia Morawska @joeallenjoe.bsky.social @isiaq.bsky.social Pres. Kerry Kinney, ASHRAE, WHO, UNEP, many others.
September 24, 2025 at 4:36 PM
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I am still fighting the good fight on the hellscape aka Twitter. After 6 months of asking, I finally got a reply from @susanholtnb.bsky.social re: adopting ASHRAE 241 clean indoor air standards. Unfortunately we know from the media GNB tests air quality of only empty classrooms, so poor datasets.
September 24, 2025 at 12:05 PM
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We could stop this with N95s in health care and ASHRAE 241 mandated for all public indoor spaces. It's just ordinary upgrades of existing regulations. We can do it!
Infections in Canada this week are expected to result in 4,800 hospitalizations, 1,000 deaths (people who die at least 1 year earlier than they would without COVID) and 24,000 new long COVID cases serious enough to limit daily life activities.
September 16, 2025 at 7:38 PM
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Have you ever looked at the school "ventilation reports" provided by the Nova Scotia Centres for Ed? They're useless. No one from the Dept of Education has explained how "operating as intended" aligns with ASHRAE standards. @nbcovidinfo.bsky.social 's thread about NB might as well be about NS.
September 3, 2025 at 9:20 PM
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We know so much around us is in a downward spiral. Here is our chance for an upward spiral. We did not get here alone; we relied on the work of so many including OSPE, ASHRAE, etc. By supporting NB’s efforts you nurture our success.
November 19, 2024 at 2:02 PM
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What can we do to make the world a better place?
Investigate. Innovate. Educate. Advocate. Collaborate.
For Public Health:
Promote Respirators, Safe Indoor Air, Zero HAIs, Novavax, CO2 Monitors, ASHRAE 241, Sentinel Intelligence, National Standards for Healthcare, Ppl who get things right
Investigate. Innovate. Educate. Advocate. Collaborate.
For Public Health:
Promote Respirators, Safe Indoor Air, Zero HAIs, Novavax, CO2 Monitors, ASHRAE 241, Sentinel Intelligence, National Standards for Healthcare, Ppl who get things right
November 11, 2024 at 3:09 PM
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Intro to CO2 Monitoring
by Joey Fox
WHAT’S GOOD FOR AIRBORNE DISEASES?
If ventilation is the only mitigation measure used, based on clean airflow rates required in ASHRAE 241 ( see image below )
#ASHRAE241 #CO2 #Ventilation #Mitigation #Risk
itsairborne.com/intro-to-mon...
by Joey Fox
WHAT’S GOOD FOR AIRBORNE DISEASES?
If ventilation is the only mitigation measure used, based on clean airflow rates required in ASHRAE 241 ( see image below )
#ASHRAE241 #CO2 #Ventilation #Mitigation #Risk
itsairborne.com/intro-to-mon...
February 7, 2024 at 4:33 PM
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This remains largely unenforced by most building codes and enforcement, despite having a case-fatality rate of 10%. ASHRAE Standard 188 and Guideline12 however has helped put liability back on the design engineer and installer, which has had some success in changing industry practices.
February 28, 2025 at 5:30 AM
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This is a small step in the right direction, but falls well short of ASHRAE 241 standards in most cases. We should let engineers handle keeping the air free from pathogens in the same way we let engineers (not physicians) handle keeping water free from pathogens. itsairborne.com/ashrae-241-c...
ASHRAE 241 Control of Infectious Aerosols Part 2— Equivalent Clean Airflow Rates
Here is how the new standard compares to the old indoor air quality stanard and guidance from other ogranizations?
itsairborne.com
January 17, 2025 at 9:32 PM
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Look who got her hands on an ASHRAE 228 standard, baby!! Oooh ahhh net zero yeahhhhh
November 28, 2023 at 9:37 PM
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192.80 was $399 #ad
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LG 8000 BTU (DOE) / (12000 ASHRAE) Portable Air Conditioner
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August 4, 2025 at 4:02 AM
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What role does adoption of ASHRAE IAQ standards and ASHRAE 241 play in the path forward for the US?
October 31, 2025 at 9:20 PM
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But it doesn't cost too much. Clean air would pay for itself in a few years via reduced absenteeism for business, and lower ER loads for governments. The common cold is the #1 cause of ER visits, and we could END IT with ASHRAE 241 mandated in all indoor public spaces. It's not economics, it's power
December 18, 2024 at 6:15 PM
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