#FreshAirSchools Resource Centre

We have collated some of the most helpful resources to help improve public understanding of airborne transmission, here and on our YouTube Channel. If you have a suggestion for further items to include, please contact us.

While we have focussed on developing a succinct selection of the available resources, we are in awe of the comprehensive database “Resources on transmission & prevention of CoVID-19” developed by Dr Alex Huffman from the University of Denver. Please do share it, and let us know if you find something there you would like added to our resource centre for easy reference.

Dr. Alex Huffman on Twitter: “Resource page on COVID transmission & prevention (focus: airborne aerosols) now:☑️790+ media articles☑️340+ science papers☑️videos; infographics; webinars; threads; tools☑️scientists & moreSearch any tab ‘Cntrl-F’#AirborneInfoTag to alert me to add.https://t.co/QUNsMNh75O / Twitter”

Resource page on COVID transmission & prevention (focus: airborne aerosols) now:☑️790+ media articles☑️340+ science papers☑️videos; infographics; webinars; threads; tools☑️scientists & moreSearch any tab ‘Cntrl-F’#AirborneInfoTag to alert me to add.https://t.co/QUNsMNh75O


BBC Breakfasts interview with NHS Doctor Matt Butler provides useful snippets of information on how schools can reduce the spread of Covid-19, even in winter, with ventilation and air cleaning technologies.

Thread by @mjb302 on Thread Reader App

How can schools reduce the spread of Covid-19 even in the colder months? The below 6 clips are from this morning’s BBC Breakfast where I, my kids (et al) and the most excellent @RaeSnape show some of the things our Primary school will be doing.


Our previous live with Professor Jose Jimenez is an excellent, in depth introduction to the topic, and he has very kindly shared his slides, FAQs and Covid Estimator for anyone to view. See also the Portable Air Cleaner Calculator for Schools, developed by Professor Jimenez, his colleague Dr Shelly Miller, and Joseph Allen, Associate Professor of Exposure Assessment Science Environmental Health at Harvard School of Public Health,

See Jose’s explanation of airborne transmission here:

Cold Weather and Coronavirus

We’re in for quite the winter, a fitting end for 2020. Here’s what you need to know about cold weather and coronavirus.


Beautifully clear explanation of airborne transmission from Professor Trisha Greenhalgh, University of Oxford, illustrated by the talented Vicki Martin: www.vickimartin.co.uk.

Aerosol transmission of Covid-19

In collaboration with Trish Greenhalgh, University of Oxford https://www.cebm.net/oxford-covid-19-evidence-service/ Version with narration here: https://www….


Professor Greenhalgh and Vicki Martin have teamed up again, this time to show how we can make indoor spaces safe. Includes information on the use of carbon dioxide monitors.

Safe Spaces: how to reduce virus transmission indoors

Guidance on reducing the risk of virus transmission indoors, using information on aerosols provided by Jose-Luis Jimenez (University of Colorado) and in coll…


Professor Catherine Noakes,  Professor of Environmental Engineering for Buildings from the University of Leeds has created informative threads on the use of CO2 monitors, and how best to achieve good ventilation using windows – essential reading!

Thread by @CathNoakes on Thread Reader App

Now more business are going to have more people in them ventilation becomes an even more important mitigation strategy You can use CO2 monitoring to help. Here’s another thread that may be useful if you are looking to use CO2 1/ Its important to remember CO2 is only a guide.

Thread by @CathNoakes on Thread Reader App

And also remember that ventilation isn’t a magic bullet. Its part of the toolbox, but also distance, mask, hands, get a vaccine and isolate if you are sick END * * * Missing some Tweet in this thread? You can try to force a refresh

Thread by @CathNoakes on Thread Reader App

A Sunday thread on ventilation metrics and exposure as they are not quite as straightforward as you may think 1/ Under steady state conditions (ie people have been in the space for a while and the ventilation is constant) then concentration in the air of anything that remains airborne (CO2, the smallest virus particles) is emission rate divided by total ventilation rate 2/ The total ventilation rate is the total volume of fresh air provided to the room, which is normally measured in m3/s, l/min or a similar metric.


Dr Eilir Hughes is a GP and founder of the #FreshAirNHS campaign, which calls for the recognition of airborne transmission and the provision of adequate PPE to guard all clinical staff against it – not just those in ICU. Parents United is grateful for his inspiration in creating #FreshAirSchools.

Dr Eilir Hughes on Twitter: “Everything I’ve said, but in an Australian accent. Repeating the same mistakes is stupid.👇🏼👇🏼👇🏼👇🏼 pic.twitter.com/vJzvrlwnkp / Twitter”

Everything I’ve said, but in an Australian accent. Repeating the same mistakes is stupid.👇🏼👇🏼👇🏼👇🏼 pic.twitter.com/vJzvrlwnkp


Trish Greenhalgh interview in which she gives simple and accessible explanations of airborne transmission and its prevention:

Is Coronavirus Airborne? | Precautions & Protection

Is SARS-COV-2 airborne as opposed to droplet-borne transmission? How does it change things for us and what can we do to protect ourselves? Listen directly fr…


Orla Hegarty, Assistant Professor at University College Dublin’s School of Architecture, Planning and Environmental Policy explains the importance of airborne transmission.

Orla Hegarty on Twitter: “Why is clean air important? The surface of your lungs is the size of a tennis court.. & 8 litres of air pass over it every minute #Covid19 pic.twitter.com/GJSXZhVuaJ / Twitter”

Why is clean air important? The surface of your lungs is the size of a tennis court.. & 8 litres of air pass over it every minute #Covid19 pic.twitter.com/GJSXZhVuaJ


More from Orla here – excellent advice for India, and for all of us.

Orla Hegarty on Twitter: “[Thread] 🇮🇳 #India Prevention #Covid19 is mostly caught by breathing infected air, not from hands 😷 Wear well-fitting masks everywhere indoors🍽 Eat & drink outside & at a distance🪟💨 ventilate rooms/vehicles, keep airflow moving at all times, open doors & windows 1/ / Twitter”

Thread] 🇮🇳 #India Prevention #Covid19 is mostly caught by breathing infected air, not from hands 😷 Wear well-fitting masks everywhere indoors🍽 Eat & drink outside & at a distance🪟💨 ventilate rooms/vehicles, keep airflow moving at all times, open doors & windows 1/


Our #FreshAirSchools video – share to help us call for appropriate mitigation against airborne transmission in schools.

PU FreshAirSchools 2021 v1

FreshAirSchools VideoShare to spread the message #CovidIsAirborne.#HandsFaceSpaceReplace #MakeSchoolsSafeSign the #FreshAirSchools Open Letter to UK Educat…


UK Health and Safety Regulations also make for interesting reading, as they make clear that:

“Employers have a duty under the Health and Safety at Work etc Act 1974 to ensure, so far as reasonably practicable, the health, safety and welfare of their employees at work. People in control of non-domestic premises have a duty towards people who are not their employees but use their premises.”

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Professor Joseph Allen, describes exactly how we feel about aerosol transmission right here. Please do take a look at Schools for Health – it is an excellent resource.

Joseph Allen on Twitter: “I’m not on Team ‘Open Schools’I’m not on Team ‘Close Schools’I’m on Team ‘GET YOUR SHIT TOGETHER AND PUT IN THE CONTROLS WE HAVE BEEN OUTLINING SINCE JUNE’https://t.co/hIbaMtMxiZ pic.twitter.com/C0IsYXVEdV / Twitter”

I’m not on Team ‘Open Schools’I’m not on Team ‘Close Schools’I’m on Team ‘GET YOUR SHIT TOGETHER AND PUT IN THE CONTROLS WE HAVE BEEN OUTLINING SINCE JUNE’https://t.co/hIbaMtMxiZ pic.twitter.com/C0IsYXVEdV


An animation of the effect of layered mitigations on level of transmission.

A room, a bar and a classroom: how the coronavirus is spread through the air

The risk of contagion is highest in indoor spaces but can be reduced by applying all available measures to combat infection via aerosols. Here is an overview of the likelihood of infection in three everyday scenarios, based on the safety measures used and the length of exposure


Animation showing how simple interventions can reduce the risk of airborne transmission in classrooms.

Why Opening Windows Is a Key to Reopening Schools

This classroom seats just nine students, all wearing typical cloth face masks, facing forward and sitting six feet apart. With all of the windows closed, the room would lack sufficient ventilation. That’s a problem with an airborne virus.


This video demonstrates the importance of social distancing in aerosol transmission, as expelled aerosols are diluted and rise like smoke.

Faster modelling to show how aerosols move indoors

Assistant Professor Ville Vuorinen is developing a code to vastly improve how aerosol clouds are modelled, allowing even regular desktop computers to compute…


Jeremy Chrysler on Twitter: “Here’s a 2x sped up version of that video that’s a little easier to watch embedded in Twitter. pic.twitter.com/8hOKlp1Mo7 / Twitter”

Here’s a 2x sped up version of that video that’s a little easier to watch embedded in Twitter. pic.twitter.com/8hOKlp1Mo7


NHS explanation of airborne transmission and the need for ventiliation.

Hands. Face. Space. | Ventilation

Every action counts when it comes to protecting ourselves and our loves ones from #COVID19.Opening windows to allow fresh air into enclosed spaces can help r…


The inimitable Bill Nye explaining masks AND making us laugh.

Bill Nye is Here to Set the Record Straight on Masks | NowThis

BILL NYE DROPS MORE MASK FACTS: ‘This is not that hard to understand, everybody’ – Bill Nye is back on TikTok to drop more knowledge about masks and COVID-19…


Using CO2 meters to determine air quality – from Professor Joseph Allen.

Ventilation & Filtration: Prevent COVID 19 + Optimize Health (Air purifiers, HEPA filters)

Harvard Prof. Joseph Allen explains how the air in our homes, workplaces, and schools is contributing to disease, poor mental function, and putting us at hig…


This Japanese super-computer simulation shows aerosols in

Supercomputer simulates how coronavirus droplets spread

Researchers use the supercomputer Fugaku to simulate how droplets of the novel coronavirus spread.**********************Subscribe to our YouTube channel: htt…


Slow motion fun with the Slo Mo Guys – and Dr Anthony Fauci:

Slow Motion Sneeze in 4K – The Slow Mo Guys with Dr Anthony Fauci

Somethings were never meant to be seen at 1000fps in 4K. I’d include this subject as one of them. Gav coughs, sneezes and talks in ultra backlit slow motion …


A simple animation to explain aerosol transmission, from the University of Colorado, Boulder.

Let’s talk about transmission of respiratory infectious diseases

Video Text by: Prof. Shelly Miller, University of Colorado Boulder.Voice by: Shelly Miller and Renee Leiden.Drawings and editing by: Prof. Marina Vance, Univ…


A good explanation on the science of masks, and engaging for children too.

How Well Do Masks Work? (Schlieren Imaging In Slow Motion!)

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateOKAY↓ More info and sources below ↓We’re on PATRE…


Super-spreader events provide unfortunate evidence of airborne transmission. They show that large numbers of people can become infected by an index case in an airborne environment, not just those who are in close contact with the infected individual.


Double masking has been found to be as effective as an N95 mask – simple and effective.

CDC: Double masks and tightly fitted single masks can reduce COVID-19 transmission by up to 96.4%

Double masking has become a trend, but until now there hasn’t been much evidence it works. A CDC study suggests popping a cloth mask over a surgical one can improve protection about 50%. There are plenty of other low-tech strategies that can improve the performance of your mask, too.


Improve the fit of your surgical mask.

How to Improve Your Surgical Mask Fit– Covid-19

Improve the fit of your surgical mask– better protection during Covid-19 by Dr. Rabeeh


Thank you to all the above resource providers to whom we have linked above.

If you find any further content on airborne transmission, please drop us a line and we will consider it for the page.

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