The Use of Tree Barks to Monitor Traffic Related Air Pollution: A Case Study in Sao Paulo-Brazil

Author(s)

Moreira, Tiana C. L. ^[1] ; Amato-Lourenco, Luis F. ^[1] ; da Silva, Gisela T. ^[2] ; Saldiva de Andre, Carmen D. ^[2] ; de Andre, Paulo A. ^[1] ; Barrozo, Ligia V. ^[3] ; Singer, Julio M. ^[2] ; Saldiva, Paulo H. N. ^{[4, 1]} ; Saiki, Mitiko ^[5] ; Locosselli, Giuliano M. ^{[6, 1]}

Affiliation

^[1] Univ Sao Paulo, Dept Patol, Fac Med, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Inst Matemat & Estat, Dept Estat, Sao Paulo - Brazil

^[3] Univ Sao Paulo, Fac Filosofia Letras & Ciencias Humanas, Dept Geog, Sao Paulo - Brazil

^[4] Univ Sao Paulo, Inst Estudos Avancados, Sao Paulo - Brazil

^[5] Comissao Nacl Energia Nucl, Inst Pesquisas Energet & Nucl, Sao Paulo - Brazil

^[6] Univ Sao Paulo, Inst Biociencias, Sao Paulo - Brazil

• Document type: Journal article
• Source: FRONTIERS IN ENVIRONMENTAL SCIENCE; v. 6, JUL 13 2018.
• Web of Science Citations: 4

Abstract

The analysis of chemical elements in the barks of trees is an alternative procedure to access spatial heterogeneity of traffic related air pollution. However, the role of tree species in the characterization of the variability of airborne pollution is poorly known. We present an observational study conducted in Sao Paulo, Brazil, based on the analysis of 498 trees from three common species: Tipuana tipu, Poincianella pluviosa, and Ligustrum sp.. We considered ANCOVA models to compare the concentrations of Al, Fe, Zn, Cu, Mn, Ba, and Sin the bark (periderm) of trees located close to streets with different levels of traffic intensity controlling for the extension of nearby green areas. The expected trend of increasing elemental concentration in the bark of trees located near streets with greater traffic intensity or close to smaller green areas was only fully evidenced by T. tipu. For instance, the concentrations of Zn, Fe, Al, and Ba increase by 200, 350, 230, and 280% respectively, for trees of this species located near arterial streets when compared to those observed near local streets. On the other hand, the concentrations of Zn, Fe, Al, and Ba are reduced by 41, 45, 50, and 30%, respectively, for trees located near green areas. For P. pluviosa, the capacity to suggest an association between the tree bark concentration of chemical elements with increasing levels of air pollution and presence of green areas was only fully observed for Zn and Cu. For Ligustrum sp., weaker and sometimes non-expected associations between bark concentrations of the chemical elements and either street classification or green area extension were observed. Our results indicate that the choice of species is a key element in the use of tree barks as a biomonitoring tool in urban landscapes. Species like T. tipu, with rough and highly porous bark, are the most appropriate for such purpose. (AU)

• FAPESP's process: 13/21728-2 - The use of modern autopsy techniques to investigate human diseases (MODAU)
• Grantee: Paulo Hilário Nascimento Saldiva
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 14/19201-9 - Determination of trace metals concentrations derived from atmospheric depositions in urban gardens of São Paulo city
• Grantee: Luís Fernando Amato Lourenço
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 15/25511-3 - Climate and pollution reconstruction based on urban tree-rings growth records
• Grantee: Giuliano Maselli Locosselli
• Support Opportunities: Scholarships in Brazil - Post-Doctorate