I think some research group did measurements of the AQI in the TTC stations and found the average air quality in the winter was actually comparable with the smog in LA or Beijing.
and people still look at me funny when I wear a mask in there
I wonder what platform doors will do: the stations depend on piston effect for ventilation, but walling off the tube from the station might keep it more in the tube?
I wonder what platform doors will do: the stations depend on piston effect for ventilation, but walling off the tube from the station might keep it more in the tube?