Our letter to Scinece in response to a call for 14L/s/p and 350ppm excess CO2 in all space. We show there is no evidence for these thresholds, and ask that we use evidence as a basis for regulating the ventilation of buildings.

Imagine a 150m3 classroom with quite low ventilation 3l/s/person and 32 occupants. If an infector is exhaling 1000 virion/hour, how many, on average, would deposit in respiratory tract of a susceptible person in 7 hr via long range inhalation?

Quiz time

Were you right?

Systematic review on impact of filtration and ventilation on viral transmission tldr: - filters filter - identified no field studies or epidemiological investigations of the “real-world” effectiveness of filters in mitigating virus transmission in humans journals.plos.org/globalpubliche…

Nice study investigating impact of air cleaners on COVID transmission on a geriatric ward tldr; nosocomial COVID infections are not eliminated by air cleaners. There *may* be a reduction in cases but CIs too large to make definitive conclusions on efficacy. more studies rqd 🧵

This extends beyond medicine, and as Alasdair states, it can result in poor policy decisions, poor spending of public monies and a breakdown in trust between public and science. Which has long term negative consequences

“The community are presented with findings which on face value appear legitimate, but in fact have a high probability of being completely wrong. Rather than being knowingly ignorant on a topic, the community think they know something, but what they know is wrong.”

Using LaTeX is WAY easier now with AI. 🧵of my top tricks. 1) Tables. Screenshot a table from anywhere, paste into Overleaf and the AI generates the LaTeX code for the table. That just saved me 10 minutes of typing in code!

More reasons to relax while on the throne!

Time to repost this seeing as the study is doing the rounds again

Not what YOUR data says. Data says that 1) alcohol-caused cancer are attributable to the minority of overdrinkers, 2) doctors are intimidated by statisticians (failed mathematicians) who don't know how to read data. Cheers (having a pre-dinner Scotch, then Chateauneuf).

New conference poster: No evidence for portable HEPA filtration units reducing respiratory infection episodes in care home residents • No evidence that episodes of fever/ delirium, gastrointestinal infections, falls or antibiotics consumed are reduced either

This paper looks at the effect of different CO2 concs (500ppm and 3000ppm) on the risk of COVID in aircraft cabin, however in all their scenarios they assume the ventilation is 10l/s/p which would result in a ss CO2 = 900ppm. Here I consider the ventilation component too 🧵

Consider this a guided tour through the problems with this kind of study….

Does anyone know?

The pandemic was a time when you would have thought people might want to improve their ventilation. But, behaviour change is hard because there are many barriers to change.

Just read one of the most ridiculous claims in a scientific journal discussion I've ever seen 👀 a therapeutic approach to gut microbiome to improve lung health impacts from air pollution 🤯 in rural Uganda! read on if you want to see how..1/n

I've written an article with chris iddon on how overstating the effects from over-ventilating risks misdirecting public funds and eroding trust in the industry when expected gains do not materialise.

#IAQ and #ventilation standards have started to change to consider the harm airborne contaminants cause to populations of people. It is informed by work done here at the University of Nottingham.