Angus Andrea Grieve-SmithMar 22

New post: Nine observations from three and a half years of carbon dioxide monitoring. #COVIDIsNotOver #COVIDIsAirborne

https://grieve-smith.com/ftn/2026/03/nine-observations-from-carbon-dioxide-monitoring/

Nine observations from carbon dioxide monitoring

Introduction In the first year of the COVID-19 pandemic I learned that we can estimate our level of risk by checking the concentration of carbon dioxide in the air, because when infected people breathe out virus aerosols, they also breathe out CO2.  I recently wrote about some limitations on this

Commentary by A. Grieve-Smith
Show threadhhfMar 22

@grvsmth nice write-up! Fits my observations. I measure CO2 since before Covid as studies show that decision making gets worse with CO2 levels and this is important for workshops and crisis-rooms.

As for your primary health provider / mothers doctor: if they can not get fresh air in, they should get an air purifier. As you wrote in your other post, that will not affect CO2, but it will affect all airborne pathogens.

Their judgment may impaired, though…

Show threadAngus Andrea Grieve-Smith

@hhf Thanks! I'm not a ventilation specialist, so I recommended to my doctor that she bring one in.

Unfortunately, my mother died last year, probably due to complications from RSV and pneumonia. She had gotten vaccinated against COVID, but refused vaccination against the flu, RSV or pneumonia, and resisted wearing masks and eating outdoors.

But she was 86, had a good life, she was suffering from Parkinson's, and told me several times she was ready to go, so I feel like I did what I could.

Mar 22 at 2:12pmWeb
Show threadhhfMar 22

@grvsmth sorry for your loss!

You don’t have to be much of a ventilation specialist to understand that any air filter in a room will improve the situation.

Long term it will be updates to building standards etc. which will hopefully improve the status everywhere.

Show threadAngus Andrea Grieve-SmithMar 22
@hhf Of course you don't have to be a ventilation specialist, but as you pointed out, it's generally bad to have high carbon dioxide in a medical office. The doctor really needs to get the airflow in her office fixed.