How a school in Chiang Mai successfully combats AQI and Covid-19

Prem Tinsulanonda International School in Chiang Mai puts student health and safety first to achieve extremely low AQI and COVID-19 transmission risks in its classrooms.

To reduce the transmission risk of COVID-19, a high ventilation rate of outside air is crucial in order to flush out airborne particles that could carry the COVID-19 virus. A good indicator of adequate ventilation rates is the indoor CO2 value. Outside air has a CO2 level of approximately 400 ppm but indoor air, especially in unventilated classrooms, can quickly reach very high levels.

Most centres of disease control recommend CO2 levels in classrooms to be below 800-1000 ppm, The German UBS (Environmental Protection Agency), for example, states below 1000 ppm. The US CDC (Center for Disease Control) goes even further and recommends CO2 levels for classrooms…