James Andrew Smith, PhDNov 18, 2022
Brian Kwok (Guelph Market)

RT @jasmith_yorku
Switching out the particulate matter filter on my @Prescientx1 [breathe] respirator. I use this one primarily on the subway here in Toronto (and another one with the thinner bioaerosol filter while teaching).

Why #TTC employees work in the subway without masks boggles my mind.

Nov 14, 2022 at 12:51amMoa
Show threadTai ViinikkaDec 26, 2022
@GuelphMarket @jasmith_yorku WOW. It would be interesting to do a physical and chemical analysis of that soot and see what it is. Street dust is one thing but subway brake dust is worse. Or maybe not.