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Al Haddrell Profile picture
@ukhadds
Jun 22, 2023 • 3 tweets • 1 min read • Read on X
I’m proud to have our latest research published on how long #SARSCoV2 remains infectious while airborne! We studied the fundamental processes that drive the loss of viral infectivity in the aerosol phase. #COVIDisAirborne

Here’s a thread going over some of the findings. Image
@ParentMishmash Interesting question btw. Actually, all of your questions have been. Thanks!
@J__Doh Here are the specific values. So, about 10 to 20 times faster decay in sunlight (depending on the season). Image

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More from @ukhadds

Al Haddrell Profile picture
Nov 30
This question came up on BlueSky. While somewhat coy, the question isn’t actually that simple to answer.

Given that I’m an “aerosol scientist”, I figured I take a crack at answering it. Image
An aerosol scientist is simply a scientist that studies aerosol.

Aerosol are any liquid or solid particle that is suspended in the air. Typically, these objects aresmaller than 100 microns. In short, we study various small airborne things. Image
These “things” can be literally anything. From biological (viruses, bacteria), to environmental (particulate matter), to industrial (spray drying), and beyond.

Thus, when someone studies aerosol, there are countless systems they could be interested in. Image
Read 14 tweets
Al Haddrell Profile picture
Nov 20
Counterpoint: you ABSOLUTELY can control an airborne virus.

Seriously, who says this kind of nonsense? We literally have numerous ways to control airborne spread.
Shoutout to @CDare10 for flagging up this idiot’s post.
@CDare10 Hey @ClareCraigPath , how do scientists study airborne viruses if they are “uncontrollable “? For example, how is airborne decay measured if it’s impossible to control an aerosol?
Read 9 tweets
Al Haddrell Profile picture
Nov 17
Since 2020, we’ve learned a tremendous amount about the airborne transmission of disease. Yet, in many ways we’ve just begun to scratch the surface.

This document came out of the WIAC conference held this summer. In it, many of the fundamental questions before us are proposed. Image
You can find a link to the article here:

iris.who.int/items/9fb7d176…
I’ve also uploaded the presentation about our research that I gave at the conference to my YouTube channel.

Read 7 tweets
Al Haddrell Profile picture
Oct 25
Over the past decade, various randomized control trials (RCT) have been published that attempt to measure the effectiveness of physical mitigation strategies of airborne disease transmission.

And for the most part, most of them are terrible.

Let me explain why.

A🧵 Image
Airborne disease transmission is extraordinarily complicated, with many steps involved. Consequently, there are many different solutions that have been proposed to limit transmission. They largely involve the removal of exhaled aerosol from the air prior to inhalation. Image
The most common physical interventions being air filtration, ventilation and masking. Image
Read 40 tweets
Al Haddrell Profile picture
Oct 20
If You Want Clean Indoor Air, Not One Thing Will Work!!

How Sadiq Khan is taking a page out of the Team GB Cycling Team’s playbook to clean up London’s air

A 🧵 Image
People spend the majority of their time indoors. As a result, indoor air quality is incredibly important for public health. So then, how do we improve the quality of indoor air?

Well, there are countless ways. That said, they can be grouped into 3 broad areas. Image
1) Source Control

Air is naturally clean. It is largely human activity that pollutes it. So, by limiting the amount of air pollution produced, we can limit our exposure. This includes both indoor and outdoor sources. Image
Read 34 tweets
Al Haddrell Profile picture
Oct 14
Another article came out that is suggesting that ventilation doesn’t work in classrooms.

Does it actually showthat?

No.

Does it find out anything new?

Also, no.

Straw Man Science? Most definitely.

Let’s get into this 🧵 Image
Here’s a link to the study:

jamanetwork.com/journals/jaman…
Context: Air filtration has been argued as an effective means to limit airborne disease transmission. Like any physical intervention of transmission, the effectiveness will depend on how it is used

In this study, they put air filters in classrooms and measured transmission rates Image
Read 19 tweets

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