Sources of particulate matter in the northeastern United States in summer: 2. Evolution of chemical and microphysical properties.

Brock, C.A.; Sullivan, A.P.; Peltier, R.E.; Weber, R.J.; Wollny, A.; de Gouw, J.A.; Middlebrook, A.M.; Atlas, E.L.; Stohl, A.; Trainer, M.K.; Cooper, O.R.; Fehsenfeld, F.C.; Frost, G.J.; Holloway, J.S.; Hübler, G.; Neuman, J.A.; Ryerson, T.B.; Warneke, C.; Wilson, J.C.