Al Haddrell
@ukhadds.bsky.social
Aerosol scientist/Aerobiologist, Canadian and #Canucks fan living in the UK. #eurovision enthusiast. https://www.youtube.com/@AlHaddrell
Getting ready to see the latest in aerosol science (with @hairyaerosol.bsky.social)! Gonna be a good week in Xi’An, China.
#IAC2026
#IAC2026
August 30, 2026 at 1:17 PM
Getting ready to see the latest in aerosol science (with @hairyaerosol.bsky.social)! Gonna be a good week in Xi’An, China.
#IAC2026
#IAC2026
Reposted by Al Haddrell
Far-UVC. What is it? How does it inactivate airborne pathogens? Will it give you sunburns? If not, why not? And if they work, why aren't they everywhere?
In my latest explainer video I dive into all these questions and try to make some sense of it all.
youtu.be/ujHMIdI2gLs
In my latest explainer video I dive into all these questions and try to make some sense of it all.
youtu.be/ujHMIdI2gLs
How Far-UVC "Safely" Inactivates Airborne Pathogens
YouTube video by Al Haddrell
youtu.be
August 9, 2026 at 3:30 PM
Far-UVC. What is it? How does it inactivate airborne pathogens? Will it give you sunburns? If not, why not? And if they work, why aren't they everywhere?
In my latest explainer video I dive into all these questions and try to make some sense of it all.
youtu.be/ujHMIdI2gLs
In my latest explainer video I dive into all these questions and try to make some sense of it all.
youtu.be/ujHMIdI2gLs
Far-UVC. What is it? How does it inactivate airborne pathogens? Will it give you sunburns? If not, why not? And if they work, why aren't they everywhere?
In my latest explainer video I dive into all these questions and try to make some sense of it all.
youtu.be/ujHMIdI2gLs
In my latest explainer video I dive into all these questions and try to make some sense of it all.
youtu.be/ujHMIdI2gLs
How Far-UVC "Safely" Inactivates Airborne Pathogens
YouTube video by Al Haddrell
youtu.be
August 9, 2026 at 3:30 PM
Far-UVC. What is it? How does it inactivate airborne pathogens? Will it give you sunburns? If not, why not? And if they work, why aren't they everywhere?
In my latest explainer video I dive into all these questions and try to make some sense of it all.
youtu.be/ujHMIdI2gLs
In my latest explainer video I dive into all these questions and try to make some sense of it all.
youtu.be/ujHMIdI2gLs
Reposted by Al Haddrell
It’s been 10 years to the day since the Brexit vote. The sun is shining, where are all the Brexit parties and parades? I was told this was the UK’s “Independence Day”, what happened?
Oh right, it was a total (and predictable) disaster.
Oh right, it was a total (and predictable) disaster.
June 23, 2026 at 6:33 PM
It’s been 10 years to the day since the Brexit vote. The sun is shining, where are all the Brexit parties and parades? I was told this was the UK’s “Independence Day”, what happened?
Oh right, it was a total (and predictable) disaster.
Oh right, it was a total (and predictable) disaster.
It’s been 10 years to the day since the Brexit vote. The sun is shining, where are all the Brexit parties and parades? I was told this was the UK’s “Independence Day”, what happened?
Oh right, it was a total (and predictable) disaster.
Oh right, it was a total (and predictable) disaster.
June 23, 2026 at 6:33 PM
It’s been 10 years to the day since the Brexit vote. The sun is shining, where are all the Brexit parties and parades? I was told this was the UK’s “Independence Day”, what happened?
Oh right, it was a total (and predictable) disaster.
Oh right, it was a total (and predictable) disaster.
Reposted by Al Haddrell
While the virology in this article is interesting, there are fundamental issues in the underlying assuptions made by the authors.
This research group believes that deep lung fluid is identical to Hanks Balanced Salt Solution. What this means is that the pH dynamics of the aerosol are incorrect.
This research group believes that deep lung fluid is identical to Hanks Balanced Salt Solution. What this means is that the pH dynamics of the aerosol are incorrect.
May 20, 2026 at 8:12 PM
While the virology in this article is interesting, there are fundamental issues in the underlying assuptions made by the authors.
This research group believes that deep lung fluid is identical to Hanks Balanced Salt Solution. What this means is that the pH dynamics of the aerosol are incorrect.
This research group believes that deep lung fluid is identical to Hanks Balanced Salt Solution. What this means is that the pH dynamics of the aerosol are incorrect.
Reposted by Al Haddrell
Over the past decade, vaping has become a popular alternative to smoking, with many teenagers picking it up. The thought being that vaping is less harmful, if harmful at all.
The question is, are they?
What happens when you vape?
In my latest explainer video I dive into this.
The question is, are they?
What happens when you vape?
In my latest explainer video I dive into this.
April 7, 2026 at 6:52 PM
Over the past decade, vaping has become a popular alternative to smoking, with many teenagers picking it up. The thought being that vaping is less harmful, if harmful at all.
The question is, are they?
What happens when you vape?
In my latest explainer video I dive into this.
The question is, are they?
What happens when you vape?
In my latest explainer video I dive into this.
Over the past decade, vaping has become a popular alternative to smoking, with many teenagers picking it up. The thought being that vaping is less harmful, if harmful at all.
The question is, are they?
What happens when you vape?
In my latest explainer video I dive into this.
The question is, are they?
What happens when you vape?
In my latest explainer video I dive into this.
April 7, 2026 at 6:52 PM
Over the past decade, vaping has become a popular alternative to smoking, with many teenagers picking it up. The thought being that vaping is less harmful, if harmful at all.
The question is, are they?
What happens when you vape?
In my latest explainer video I dive into this.
The question is, are they?
What happens when you vape?
In my latest explainer video I dive into this.
These are the accounts that Elon promotes over on X. This is why the discourse on that app has gone down the tubes, he’s turned the place into the Mos Eisley Cantina.
April 6, 2026 at 6:35 AM
These are the accounts that Elon promotes over on X. This is why the discourse on that app has gone down the tubes, he’s turned the place into the Mos Eisley Cantina.
Airborne disease transmission doesn't just affect human populations. In collaboration with Herek Clack at the University of Michigan, my team has been funded $2M to study mechanisms of bird flu decay in the air, and to explore novel mitigation strategies.
www.news-medical.net/news/2026032...
www.news-medical.net/news/2026032...
Study explores airborne bird flu decay in livestock environments
Discovering how the bird flu virus degrades in the air around livestock and how engineering solutions can effect that degradation quickly and efficiently are core aims of a new University of Michigan ...
www.news-medical.net
March 29, 2026 at 4:29 PM
Airborne disease transmission doesn't just affect human populations. In collaboration with Herek Clack at the University of Michigan, my team has been funded $2M to study mechanisms of bird flu decay in the air, and to explore novel mitigation strategies.
www.news-medical.net/news/2026032...
www.news-medical.net/news/2026032...
Aerosols are very small, have a high surface to volume ratio and can readily reach super saturation. This combination makes them a unique environment for chemical reactions. We had a paper published in JACS that looked into the rate of chemical reactions within and on aerosols.
March 21, 2026 at 12:55 PM
Aerosols are very small, have a high surface to volume ratio and can readily reach super saturation. This combination makes them a unique environment for chemical reactions. We had a paper published in JACS that looked into the rate of chemical reactions within and on aerosols.
LinkedIn is cyberbullying me.
March 11, 2026 at 7:40 PM
LinkedIn is cyberbullying me.
I just wanted to give a shout out to @melunaka.bsky.social and thank them for making french subtitles (and fixing the english ones...) for my "SARS-CoV-2, CO2 and You" video! Looks great!
Hi, we fixed and fully resynced the English subtitles, and translated them into French! You can download them here:
share.notiz.fr/f.php?h=1Gx3...
share.notiz.fr/f.php?h=1Gx3...
NotiZ - Share files
share.notiz.fr
February 27, 2026 at 8:27 AM
I just wanted to give a shout out to @melunaka.bsky.social and thank them for making french subtitles (and fixing the english ones...) for my "SARS-CoV-2, CO2 and You" video! Looks great!
Reposted by Al Haddrell
Since measles is coming back, here's a question:
What is the "half-life" of airborne decay of measles?
Answer: We have no idea. People think it's long (1 to 2 hours).
Why don't we know? Funders largely felt there wasn't a need to measure it since it was managed with vaccines.
What is the "half-life" of airborne decay of measles?
Answer: We have no idea. People think it's long (1 to 2 hours).
Why don't we know? Funders largely felt there wasn't a need to measure it since it was managed with vaccines.
February 26, 2026 at 7:27 PM
Since measles is coming back, here's a question:
What is the "half-life" of airborne decay of measles?
Answer: We have no idea. People think it's long (1 to 2 hours).
Why don't we know? Funders largely felt there wasn't a need to measure it since it was managed with vaccines.
What is the "half-life" of airborne decay of measles?
Answer: We have no idea. People think it's long (1 to 2 hours).
Why don't we know? Funders largely felt there wasn't a need to measure it since it was managed with vaccines.
Since measles is coming back, here's a question:
What is the "half-life" of airborne decay of measles?
Answer: We have no idea. People think it's long (1 to 2 hours).
Why don't we know? Funders largely felt there wasn't a need to measure it since it was managed with vaccines.
What is the "half-life" of airborne decay of measles?
Answer: We have no idea. People think it's long (1 to 2 hours).
Why don't we know? Funders largely felt there wasn't a need to measure it since it was managed with vaccines.
February 26, 2026 at 7:27 PM
Since measles is coming back, here's a question:
What is the "half-life" of airborne decay of measles?
Answer: We have no idea. People think it's long (1 to 2 hours).
Why don't we know? Funders largely felt there wasn't a need to measure it since it was managed with vaccines.
What is the "half-life" of airborne decay of measles?
Answer: We have no idea. People think it's long (1 to 2 hours).
Why don't we know? Funders largely felt there wasn't a need to measure it since it was managed with vaccines.
Reposted by Al Haddrell
Anyone who thinks A.I. is going to take everyone's jobs hasn't used A.I. to solve a technical problem.
February 26, 2026 at 5:42 PM
Anyone who thinks A.I. is going to take everyone's jobs hasn't used A.I. to solve a technical problem.
Anyone who thinks A.I. is going to take everyone's jobs hasn't used A.I. to solve a technical problem.
February 26, 2026 at 5:42 PM
Anyone who thinks A.I. is going to take everyone's jobs hasn't used A.I. to solve a technical problem.
Reposted by Al Haddrell
The Clean Air for Kids explainer video has reached 1,000 views! Thank you to everyone who 'liked' and shared it, and especially those who have subscribed!
This is the 5th video on my channel to pass the 1k mark, with 'SARS-CoV-2, CO2 and You' passing 4k views (randomly, on today as well).
This is the 5th video on my channel to pass the 1k mark, with 'SARS-CoV-2, CO2 and You' passing 4k views (randomly, on today as well).
February 24, 2026 at 9:44 PM
The Clean Air for Kids explainer video has reached 1,000 views! Thank you to everyone who 'liked' and shared it, and especially those who have subscribed!
This is the 5th video on my channel to pass the 1k mark, with 'SARS-CoV-2, CO2 and You' passing 4k views (randomly, on today as well).
This is the 5th video on my channel to pass the 1k mark, with 'SARS-CoV-2, CO2 and You' passing 4k views (randomly, on today as well).
The Clean Air for Kids explainer video has reached 1,000 views! Thank you to everyone who 'liked' and shared it, and especially those who have subscribed!
This is the 5th video on my channel to pass the 1k mark, with 'SARS-CoV-2, CO2 and You' passing 4k views (randomly, on today as well).
This is the 5th video on my channel to pass the 1k mark, with 'SARS-CoV-2, CO2 and You' passing 4k views (randomly, on today as well).
February 24, 2026 at 9:44 PM
The Clean Air for Kids explainer video has reached 1,000 views! Thank you to everyone who 'liked' and shared it, and especially those who have subscribed!
This is the 5th video on my channel to pass the 1k mark, with 'SARS-CoV-2, CO2 and You' passing 4k views (randomly, on today as well).
This is the 5th video on my channel to pass the 1k mark, with 'SARS-CoV-2, CO2 and You' passing 4k views (randomly, on today as well).
Reposted by Al Haddrell
I got this question that I thought some might find interesting.
In short, why does the CO2 levels in a hockey arena trend upwards even though it has an upgraded HVAC?
In short, why does the CO2 levels in a hockey arena trend upwards even though it has an upgraded HVAC?
Hey @ukhadds.bsky.social, quick question about arena experience. I sat in the upper part for a Sharks game, 17k people. CO2 at 700 pregame, linearly to 2k at end. SAP Center says it upgraded HVAC to meet CDC/ASHRAE (below). Any idea why CO2 kept going up w/ high ACH?
February 23, 2026 at 9:38 PM
I got this question that I thought some might find interesting.
In short, why does the CO2 levels in a hockey arena trend upwards even though it has an upgraded HVAC?
In short, why does the CO2 levels in a hockey arena trend upwards even though it has an upgraded HVAC?
I got this question that I thought some might find interesting.
In short, why does the CO2 levels in a hockey arena trend upwards even though it has an upgraded HVAC?
In short, why does the CO2 levels in a hockey arena trend upwards even though it has an upgraded HVAC?
Hey @ukhadds.bsky.social, quick question about arena experience. I sat in the upper part for a Sharks game, 17k people. CO2 at 700 pregame, linearly to 2k at end. SAP Center says it upgraded HVAC to meet CDC/ASHRAE (below). Any idea why CO2 kept going up w/ high ACH?
February 23, 2026 at 9:38 PM
I got this question that I thought some might find interesting.
In short, why does the CO2 levels in a hockey arena trend upwards even though it has an upgraded HVAC?
In short, why does the CO2 levels in a hockey arena trend upwards even though it has an upgraded HVAC?
Reposted by Al Haddrell
This horrific. Tuskegee 2.0.
Denying children healthcare ‘to see what happens’ is as unethical as it gets.
How this happens:
DOGE cuts -> experts leaving -> untrained ideologues hired -> unethical study on African children being approved.
Gross.
Denying children healthcare ‘to see what happens’ is as unethical as it gets.
How this happens:
DOGE cuts -> experts leaving -> untrained ideologues hired -> unethical study on African children being approved.
Gross.
Exclusive: A Rolling Stone investigation uncovered irregularities in the ethics review of a $1.6 million research grant to examine the effects of a birth dose of the hepatitis B vaccine in the African nation of Guinea-Bissau.
Story: www.rollingstone.com/politics/pol...
Story: www.rollingstone.com/politics/pol...
February 22, 2026 at 8:03 AM
This horrific. Tuskegee 2.0.
Denying children healthcare ‘to see what happens’ is as unethical as it gets.
How this happens:
DOGE cuts -> experts leaving -> untrained ideologues hired -> unethical study on African children being approved.
Gross.
Denying children healthcare ‘to see what happens’ is as unethical as it gets.
How this happens:
DOGE cuts -> experts leaving -> untrained ideologues hired -> unethical study on African children being approved.
Gross.
This horrific. Tuskegee 2.0.
Denying children healthcare ‘to see what happens’ is as unethical as it gets.
How this happens:
DOGE cuts -> experts leaving -> untrained ideologues hired -> unethical study on African children being approved.
Gross.
Denying children healthcare ‘to see what happens’ is as unethical as it gets.
How this happens:
DOGE cuts -> experts leaving -> untrained ideologues hired -> unethical study on African children being approved.
Gross.
Exclusive: A Rolling Stone investigation uncovered irregularities in the ethics review of a $1.6 million research grant to examine the effects of a birth dose of the hepatitis B vaccine in the African nation of Guinea-Bissau.
Story: www.rollingstone.com/politics/pol...
Story: www.rollingstone.com/politics/pol...
February 22, 2026 at 8:03 AM
This horrific. Tuskegee 2.0.
Denying children healthcare ‘to see what happens’ is as unethical as it gets.
How this happens:
DOGE cuts -> experts leaving -> untrained ideologues hired -> unethical study on African children being approved.
Gross.
Denying children healthcare ‘to see what happens’ is as unethical as it gets.
How this happens:
DOGE cuts -> experts leaving -> untrained ideologues hired -> unethical study on African children being approved.
Gross.
Study proves what we’ve already know, Elon has turned Twitter into a right wing propaganda fire hose.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
The political effects of X’s feed algorithm - Nature
Among users initially on a chronological feed, 7 weeks of exposure to X’s algorithmic feed in 2023 shifted political attitudes and account-following behaviour in a more conservative direction compared...
www.nature.com
February 21, 2026 at 1:04 AM
Study proves what we’ve already know, Elon has turned Twitter into a right wing propaganda fire hose.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
It was a great honour to be part of the PERFORM team that was awarded the Royal Society of Chemistry 2025 Faraday Horizon Prize for advances in understanding the physicochemical properties of exhaled aerosol and their impact on the transmissibility of respiratory pathogens.
February 19, 2026 at 8:57 PM
It was a great honour to be part of the PERFORM team that was awarded the Royal Society of Chemistry 2025 Faraday Horizon Prize for advances in understanding the physicochemical properties of exhaled aerosol and their impact on the transmissibility of respiratory pathogens.