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Author(s): Klara Slezakova
Dionísia Castro
Arlindo Begonha
Cristina Delerue Matos
Maria da Conceicao Alvim Ferraz
Simone Morais
Maria do Carmo Pereira
Title: Air pollution from traffic emissions in Oporto, Portugal: health and environmental implications
Issue Date: 2011
Abstract: Air pollution represents a serious risk not only to environment and human health, but also to historical heritage. In this study, air pollution of the Oporto Metropolitan Area and its main impacts were characterized. The results showed that levels of CO, PM(10) and SO(2) have been continuously decreasing in the respective metropolitan area while levels of NO and NO(2) have not changed significantly. Traffic emissions were the main source of the determined polycyclic aromatic hydrocarbons (PAHs; 16 PAHs considered by U.S. EPA as priority pollutants, dibenzo[a,l]pyrene and benzo[j]fluoranthene) in air of the respective metropolitan area. The mean concentration of 18 PAHs in air was 69.9 +/- 39.7 ng m(-3) with 3-4 rings PAHs accounting for 75% of the total Sigma(PAHs). The health risk analysis of PAHs in air showed that the estimated values of lifetime lung cancer risks considerably exceeded the health-based guideline level. Analytical results also confirm that historical monuments in urban areas act as passive repositories for air pollutants present in the surrounding atmosphere. FTIR and EDX analyses showed that gypsum was the most important constituent of black crusts of the characterized historical monument Monastery of Serra do Pilar classified as "UNESCO World Cultural Heritage". In black crusts, 4-6 rings compounds accounted approximately for 85% of Sigma(PAHs). The diagnostic ratios confirmed that traffic emissions were the major source of PAHs in black crusts; PAH composition profiles were very similar for crusts and PM(10) and PM(2.5).
Subject: Química
Chemical sciences
Scientific areas: Ciências exactas e naturais::Química
Natural sciences::Chemical sciences
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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