Gehling, William Environmentally persistent free radicals and their lifetimes in PM2.5. [electronic resource] - Environmental science & technology Aug 2013 - 8172-8 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 1520-5851 Standard No.: 10.1021/es401767m doi Subjects--Topical Terms: Free RadicalsParticulate Matter