Okay, going to put our answers into a 🧵 because out of order…
https://twitter.com/janefgreen/status/1425986243079380994
So are we satisfied? No, not really. If we had a do-over: 6 air changes or more, so more clean air per kid; 2 “True HEPA” air cleaners (no negative ions) in ALL or at least the ⅓ worst rooms, and classroom CO2 monitors to identify risky spaces, prompt teacher to open windows.
There is a major benefit to bringing classroom ventilation and filtration up to code, or just past code, and it's especially big for classrooms that had the least air coming in at the start. So while we'd push for greater, also want to recognize this!
FYI @janefgreen
Risk is increased by more infectious Delta 🦠, full classroom occupancy, no-quarantine policy for exposed masked or vaccinated children, reduction in who's a close contact, and reduced distancing.
Any increase to the targets for ventilation/filtration helps offset this.
Any increase to the targets for ventilation/filtration helps offset this.
Wish parents could organize drive to buy extra True HEPA cleaners (choose one model) for equitable distribution to all schools, to double up in the classrooms. Real HEPAs provide steady risk reduction by removing particles in air — not as variable as all the different masks.
The #DeltaVariant moved the goalposts on all of us.
Last year, because APS ran at about half capacity or less with hybrid, many classrooms probably DID have about 10 L/s/person of uncontaminated air, the international engineering group's target. Cases seemed under control.
Last year, because APS ran at about half capacity or less with hybrid, many classrooms probably DID have about 10 L/s/person of uncontaminated air, the international engineering group's target. Cases seemed under control.
This year, with full capacity, they basically cut the amount of uncontaminated air per kid in half. So increasing ventilation again (get additional True HEPA cleaners that are real HEPA cleaners) should be considered. But all school officials have just tuned out this issue.
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