Improved classroom ventilation could reduce COVID-19 risk
GRAPHIC: Four of the six classrooms monitored for CO2 by the HUB had maximum CO2 levels between 1,000ppm and 1,200ppm,
Read moreGRAPHIC: Four of the six classrooms monitored for CO2 by the HUB had maximum CO2 levels between 1,000ppm and 1,200ppm,
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