Steel dust in the New York City subway system as a source of manganese, chromium, and iron exposures for transit workers.
Chillrud SN, Grass D, Ross JM, Coulibaly D, Slavkovich V, Epstein D, Sax SN, Pederson D, Johnson D, Spengler JD, Kinney PL, Simpson HJ, Brandt-Rauf P. Steel dust in the New York City subway system as a source of manganese, chromium, and iron exposures for transit workers. J Urban Health. 2005 Mar; 82(1):33-42.