He said carrying around a CO2 detector has helped him make informed decisions about possible COVID-19 exposure. "We are all being forced to do that," he said of the constant decisions about risk.

He said carrying around a CO2 detector has helped him make informed decisions about possible COVID-19 exposure. "We are all being forced to do that," he said of the constant decisions about risk.

Carbon dioxide (CO2) sensors track the quality of the air students are breathing and should help the province limit the spread of COVID-19 within classrooms.