What street, by the way? Because I lived in Manhattan and Brooklyn for over 15 years, biking on the streets, and this wasn’t ever a problem for me. But there are some roads, especially the exits of the tunnels, that can be particularly bad as they’re just nonstop traffic all day every day. I used to run a server room in a building directly over the exit of the Lincoln Tunnel and those server racks got coated with black particulate, it would permanently stain any clothes I accidentally put in contact with them.