Quebec schools without air purifiers have 3 to 4 times more #COVID-19 cases, says dad running citizen count | CTV News
MONTREAL — It’s been about four months since Montreal schoolchildren began, unintentionally, to take part in what may end up being a huge naturally occurring science experiment: how well air purifiers work.
Since January, most English public schools in the Montreal area have had air purifiers, air exchangers or some other form of extra air-quality device if they don’t have built-in mechanical ventilation.
French public schools in the same types of buildings have not had air purifiers.
The provincial government continues to say that air purifiers aren’t necessary or proven to work, but the citizen paying the closest attention to the numbers says that based on his data so far, it seems they do.