Old school buildings in NYC do not have central HVAC and very limited window openings. Hallways and stairwells have no air circulation. How many school buildings in NYC are like this? And where are they?
One school I know of is not bringing in fans or HEPA filter portable units. Principal is not concerned, has very poor ventilation in common offices.
Example of the school building https://goo.gl/maps/VLWkLamNsvdbeAKUA
Classrooms have only 3 windows, only 2 can open just about a foot, not the full half height.