Toronto’s subway system will likely get more crowded in the coming weeks as cold weather returns and people have fewer options to get to school and work. The Star took a closer look at how the subway ventilation system works to determine how it could affect the transmission of the virus. In order to regulate the temperature inside the car, air is taken in from outside at a slower rate than air from inside is recycled. This mixture is filtered through the HVAC units about once every four minutes. Loading... Loading... Loading... Loading... Loading... Loading...How does air travel in the subway car?

Source: thestar September 28, 2020 12:00 UTC