Sulfate, nitrate and chloride in PM10 in the city of San José, Costa Rica: 2004-2006

J. HERRERA MURILLO, J.F. ROJAS MARÍN, S. RODRÍGUEZ ROMÁN, R. GARCÍA MARTÍNEZ

Abstract

The analysis of PM10 levels in two sites of the city of San José (Catedral Metropolitana and Junta de Educación), in a period of 2.5 years (April 2004-October 2006), reported a median of 39 ± 8 and 27 ± 8 µg m-3, respectively. In addition, SO42-, NO3- and Cl- levels were measured in both areas, where annual averages resulted not significantly different between each other. The analysis of main components, applied to the collected data, reveals a 65% of total variance explained by two factors. The PC1 correlates Cl- concentration and wind speed, indicating a marine contribution to this ion. The PC2 shows a relation between SO42-, NO3- and PM10 levels, demonstrating its anthropogenic origin.

Keywords

ATMOSPHERIC AEROSOLS; INORGANIC ANIONS; SAN JOSÉ-COSTA RICA

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