imagine if i cancelled the remainder of every university class i taught once the CO2 level in the classroom rose to over 1000 ppm, on the basis of that study referred to in the boost. imagine if professors banded together, equipped ourselves with CO2 sensors, and we all did cancelled class time spent above 1000 ppm. then we would get better ventilation on campus. and the students would get better learning experiences!! #CovidIsNotOver #Ventilation #MaskUpIndoors