According to CPS, which assessed the ventilation, 94% of the more than 36,000 spaces in school buildings — including classrooms, administrative offices, gyms, libraries and nurse offices — are cleared for the return of students. Ninety-nine percent of the classrooms assessed were cleared. A space must have a functioning mechanical ventilation system or a working window with at least one air purifier, depending on the size of the room.
CPS releases ventilation and air quality assessments, says most classrooms are cleared for students to return

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