(The Canadian Press/ CTV News) — Three quarters of Montreal-area classrooms tested as part of a small “secret project” show significant ventilation issues favouring COVID-19 transmission, a group of doctors and experts has found.
The COVID-STOP group recruited 12 teachers to test the air in 25 classrooms and premises in Montreal-area schools with machines commonly known as CO2Meter and CO2Mini.
In three out of four classes tested in secret, ventilation was problematic and CO2 levels exceeded the acceptable level of 700 to 800 ppm, the group revealed in a statement Wednesday.
In some classes, the rates rose to more than 2,100 ppm.
International specialists, including José Luis Jimenez from the University of Colorado, recommend a maximum concentration rate of 650 to 800 ppm, said COVID-STOP. (…)