Sulfate, nitrate and chloride in PM10 in the city of San José, Costa Rica: 2004-2006
Titel:
Sulfate, nitrate and chloride in PM10 in the city of San José, Costa Rica: 2004-2006
Auteur:
J. HERRERA MURILLO J. F. ROJAS MARÍN S. RODRÍGUEZ ROMÁN R. GARCÍA MARTÍNEZ
Verschenen in:
Atmósfera
Paginering:
Jaargang 23 (2010) nr. 1 pagina's 83-94
Jaar:
2010
Inhoud:
The analysis of PM10 levels in two sites of the city of San José (Catedral Metropolitana and Junta de Edu- cación), 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- concentra- tion and wind speed, indicating a marine contribution to this ion. The PC2 shows a relation between SO42-, NO- and PM levels, demonstrating its anthropogenic origin.
Uitgever:
Centro de ciencias de la atmósfera, Universidad nacional autonoma de México (provided by DOAJ)