TY - JOUR A1 - Hand, J. L. A1 - Schichtel, B. A. A1 - Malm, W. C. A1 - Pitchford, M. L. T1 - Particulate sulfate ion concentration and SO2 emission trends in the United States from the early 1990s through 2010 JO - Atmos. Chem. Phys. J1 - ACP VL - 12 IS - 21 SP - 10353 EP - 10365 Y1 - 2012/11/07 PB - Copernicus Publications SN - 1680-7324 UR - http://www.atmos-chem-phys.net/12/10353/2012/ L1 - http://www.atmos-chem-phys.net/12/10353/2012/acp-12-10353-2012.pdf DO - 10.5194/acp-12-10353-2012 ER -