LET'S AIR (@nousaerons) / X

LET'S AIR

4,506 posts

LET'S AIR

@nousaerons

News, scientific mediation and infographics on ventilation & indoor air quality. Also on BlueSky.

Joined April 2021

Pinned
LET'S AIR
@nousaerons
Sep 22, 2025
Here's something that could be hung on the wall of every classroom, hospital, or office: a CO2 monitor that would remind us of what good indoor air renewal can prevent: numerous contaminations. It's reliable and inexpensive to manufacture.
42K
LET'S AIR
@nousaerons
Sep 30, 2024
A store window displaying the CO2 level measured inside? Science fiction? No, it's happening in Japan. In this country, many public places display the CO2 level measured to assess the quality of indoor air renewal. 1/3
201K
LET'S AIR
@nousaerons
Mar 10, 2024
What is the COVID-19 airborne infection probability in an outpatient consultation with four individuals in the room ? A 🇯🇵 research team estimated this risk based on the CO2 level in the room. Calculations are also useful for measles, chickenpox, flu ... link.springer.com/article/10.100…
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LET'S AIR
@nousaerons
May 21, 2023
Customers of a shopping center in Osaka 🇯🇵 are informed of the indoor air CO2 level they breathe. The levels displayed on the screen are excellent. Thanks to @pezmico for the photo.
116K
LET'S AIR
@nousaerons
Jan 3, 2023
We offer a translation into English of our synoptic on the new French environmental code relating to the measurement of CO2 in schools. A PDF version is available at nousaerons.fr/regulations This is intended for foreigners who have expressed an interest in this new code.
1.5M
LET'S AIR
@nousaerons
Oct 1, 2024
Below, technicians change a HEPA filter designed to purify the air inside a plane in which passengers spend a few hours. It's astonishing that such filters aren't installed in all schools to protect the children who spend whole days there, sometimes in very confined rooms.
124K
LET'S AIR
@nousaerons
Oct 14, 2024
State of the art in an elevator at an American pediatric health centre. This should be the standard, but for the moment it's the exception. Congratulations to this health centre for its policy of minimising the spread of airborne diseases.
Martha-JD, MBA, PCC-😷🇺🇦
@mryoung151
Oct 13, 2024
Replying to @mdc_martinus
Here was what one pediatric health center installed in their elevator in the U.S. It can be made safer
34K
LET'S AIR
@nousaerons
May 19, 2023
In two secondary schools in Switzerland, from January to March 2022 during the omicron wave, concentrations of airborne SARS-CoV-2 were, on average, 70% lower with mask mandates and 40% lower with air cleaners.
New study shows masks and air cleaners were associated with stopping COVID-19 in two Swiss schools
From medicalxpress.com
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LET'S AIR
@nousaerons
Apr 27, 2024
Latvia (population 1.9 M) monitors the indoor air quality of 14,000 classrooms in 875 schools. CO2 levels, temperature and relative humidity can be viewed freely online at: co2.mesh.lv It is one of the most advanced countries in this field and a source of inspiration.
121K
LET'S AIR
@nousaerons
Feb 10, 2023
“Health medical officers have agreed to recognize that the indoor air is stale when the proportion of CO2 in it exceeds 600ppm.” In an 1884 report on health and safety in French schools by a Dr. Javal gallica.bnf.fr/ark:/12148/bpt…
69K
LET'S AIR
@nousaerons
Apr 3, 2023
After a COVID-19 breakout in a 🇯🇵 factory, the ventilation system was upgraded to make it 10 times more effective. Private-sector investments are being made all over the world. A scientific report in @Nature : nature.com/articles/s4159…
93K
LET'S AIR
@nousaerons
Mar 17, 2024
Astonishingly, back in 1888, students at @MIT were already taught that the CO2 level could be used to monitor the quality of indoor air renewal, and the recommended levels were exactly those recommended today by experts: 600, 800, 1000 and 1500 ppm. Many thanks to @mdc_martinus.
Maarten De Cock
@mdc_martinus
Mar 16, 2024
Replying to @mdc_martinus
Assessment of indoor air quality with CO2 concentrations, anno 1888.
38K
LET'S AIR
@nousaerons
Oct 10, 2024
A HEPA filter is being replaced in an air purifier located in a classroom where children's health is a concern. Thanks to @SmartairUk for sharing this photo. There are filters in our planes and in our cars, but surprisingly rarely in our schools.
LET'S AIR
@nousaerons
Oct 1, 2024
Below, technicians change a HEPA filter designed to purify the air inside a plane in which passengers spend a few hours. It's astonishing that such filters aren't installed in all schools to protect the children who spend whole days there, sometimes in very confined rooms.
11K
LET'S AIR
@nousaerons
Aug 26, 2024
According to its website, the arena where the Democratic National Convention was held achieves a remarkable 8.6 complete indoor air changes per hour. But with such a density of very active attendees, contamination at close range can only be avoided by wearing a mask. 1/2
Dr. Lucky Tran
@luckytran
Aug 25, 2024
The positive tests from DNC attendees are rolling in. The "surprise" guest was COVID.
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