@QuigleyEimear@KevinSharpe59 Response from @NormaFoleyTD1 basically says:
800ppm is good, but not covid free.
1500ppm is bad so when it gets there, best to open more windows.
@QuigleyEimear@KevinSharpe59@NormaFoleyTD1 I recieved this letter from Dept of Ed this morning. It seems to backtrack and now giving 800ppm as guidance for C02 monitors when they send them to schools Aug/Sept instead of 1400/1500.