Should we worry about the air quality in the subway?

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I saw this post which largely reproduced this article and wondered about the Toronto subway where in summer the heat and humidity alone can be oppressive at peak, especially since some cars don't have air conditioning. Now I wonder whether the conditions observed in Sweden are true here.

If so, I think they increase the case for installing full length screens at all subway platforms. Not only would they increase the efficiency of air conditioning on platforms by reducing leakage into the tunnels but they would be an impediment to suicides and accidental track incursions while permitting the operation of shorter subway cars in offpeak times in a safe manner.

(Note: there are operational impediments to 3/4 car operation but that's another matter.)

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