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 This is intended for foreigners who have expressed an interest in this new code.

1 corresponds to the situation of many schools, 2 is a situation which is mediocre but which many would certainly be satisfied with (compared to the levels seen in 1) and 3 is quite exceptional, extremely rare, singular.

"St. Peter (Canton, Ohio) had just closed on Friday due to the excessive number of staff and student illnesses, the school alerted last week, saying it would close for disinfection of the building." Our question: is indoor air disinfection also planned?

Our examples of real-life CO2 measurements in more or less well-ventilated premises are now available in PDF files at . The measurements were carried out in classrooms at a secondary school, a university, an engineering school and a meeting room.

RT @gazoo32: @1goodtern My pediatric cardiologist’s office. Far UV-C all over. Masked staff. He wore an Aura N95. It is possible. It was ut…

In @abcnews: according to @CDCgov, flu is spread mainly by tiny droplets made when people cough, sneeze, or talk. They can land in the mouths or noses. Not in @abcnews: flu is also spread by airborne particles that remain in the air and are breathed in.

A morning with students in a university classroom. Not good for health, not good for learning.

What's happening in the UK is certainly representative of the inertia of the public health system to take account of the latest scientific advances in airborne transmission. This is incomprehensible to many. 🔽

Pandemic money was meant to clear the air in Ontario 🇨🇦 schools.  Did it work?

RT @cleanairschool: 📢 Register today for @EPA's webinar "Reducing Airborne Viruses in Schools: Optimizing Ventilation and Energy Efficiency…

RT @UNISONinSchools: Improving Air Quality in Schools: what can we do? Exploring the impact of polluted air on the health, attendance and…

Indoor Air Quality at a 🇫🇷 university: a participatory CO2 measurement campaign highlights the wide gap between reality and the law. The author of this preprint checked if legal requirements are met. (spoiler alert: no). We began to study this major work.

Original document in French from @LaSF2H :

Technical solutions have existed since the 19th century to ensure excellent ventilation in auditoriums and amphitheatres. Some theaters and universities have adopted these solutions to ensure excellent indoor air quality 🔽.

@ukhadds @Eerrnn @Pourquoidocteur Yes, the greatest danger is excessive generalization to all contexts. A HEPA air cleaner in an unventilated classroom with closed windows will always be beneficial.

@Eerrnn @Pourquoidocteur The article seems solid to us, but we will follow the feedback of the aerosol scientists as @ukhadds . Another expert was asked to proofread the paper.

@lion_peacock @ukhadds Yes, this is one of the scientists we were referring to. His review of the paper:

Study in a hospital with mechanical ventilation: additional portable air cleaners may induce aerosol dispersion in adjacent rooms. It has been observed that interactions between air flows can generate unexpected effects.