Water-soluble ions and trace metals in airborne particles over urban areas of the state of sauo paulo, Brazil: influences of local sources and long range transport - Vasconcellos, Pérola de Castro; Balasubramanian, Rajasekhar; Bruns, Roy Edward; Sanchez Ccoyllo, Ódon Román; Andrade, Maria de Fátima; Flues, Marlene (Water, Air and Soil Pollution, 2007)