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. 2024 Apr 16;12(4):293.
doi: 10.3390/toxics12040293.

Spatiotemporal Gradients of PAH Concentrations in Greek Cities and Associated Exposure Impacts

Irini Tsiodra  1 , Kalliopi Tavernaraki  1   2 , Georgios Grivas  1 , Constantine Parinos  3 , Kyriaki Papoutsidaki  2 , Despina Paraskevopoulou  1   2 , Eleni Liakakou  1 , Alexandra Gogou  3 , Aikaterini Bougiatioti  1 , Evangelos Gerasopoulos  1 , Maria Kanakidou  2   4   5 , Nikolaos Mihalopoulos  1   2
Affiliations

Spatiotemporal Gradients of PAH Concentrations in Greek Cities and Associated Exposure Impacts

Irini Tsiodra et al. Toxics. .

Abstract

To study the spatiotemporal variability of particle-bound polycyclic aromatic hydrocarbons (PAHs) and assess their carcinogenic potential in six contrasting urban environments in Greece, a total of 305 filter samples were collected and analyzed. Sampling sites included a variety of urban background, traffic (Athens, Ioannina and Heraklion), rural (Xanthi) and near-port locations (Piraeus and Volos). When considering the sum of 16 U.S. EPA priority PAHs, as well as that of the six EU-proposed members, average concentrations observed across locations during summer varied moderately (0.4-2.2 ng m-3) and independently of the population of each site, with the highest values observed in the areas of Piraeus and Volos that are affected by port and industrial activities. Winter levels were significantly higher and more spatially variable compared to summer, with the seasonal enhancement ranging from 7 times in Piraeus to 98 times in Ioannina, indicating the large impact of PAH emissions from residential wood burning. Regarding benzo(a)pyrene (BaP), an IARC Group 1 carcinogen and the only EU-regulated PAH, the winter/summer ratios were 24-33 in Athens, Volos, Heraklion and Xanthi; 60 in Piraeus; and 480 in Ioannina, which is afflicted by severe wood-burning pollution events. An excellent correlation was observed between organic carbon (OC) and benzo(a)pyrene (BaP) during the cold period at all urban sites (r2 > 0.8) with stable BaP/OC slopes (0.09-0.14 × 10-3), highlighting the potential use of OC as a proxy for the estimation of BaP in winter conditions. The identified spatiotemporal contrasts, which were explored for the first time for PAHs at such a scale in the Eastern Mediterranean, provide important insights into sources and controlling atmospheric conditions and reveal large deviations in exposure risks among cities that raise the issue of environmental injustice on a national level.

Keywords: Eastern Mediterranean; Greece; benzo(a)pyrene; biomass burning; diagnostic ratio; exposure risk; polycyclic aromatic hydrocarbons.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Map of Greece displaying the six cities where PAH measurements were conducted. The two sites in the Greater Area of Athens are shown in the insert panel.
Figure 2
Figure 2
Seasonal variability of BaP mean concentration (a,b) at the six sites (dashed line for the EU target value) and correlation between the 16 EPA (high slope) and the 6 EU-proposed (low slope) PAHs with BaP (c).
Figure 3
Figure 3
Seasonal variability of Σ16PAH concentrations by MW group in (a) winter and (b) summer in the six cities. Different colors represent the low- (LMW), medium- (MMW) and high- (HMW) molecular weight fractions.
Figure 4
Figure 4
Diagnostic ratio (DR) cross-plot diagrams, (a) BaA/(BaA + Chr) to Ant/(Ant + Phe) and (b) IP/(IP + BghiP) to BaA/(BaA + Chr), based on PAHs concentrations measured in the six cities. DR ranges delineate the impacts of potential PAH sources.
Figure 5
Figure 5
Correlations of BaP with OC (a) and EC (b), including winter data from the six sites.
See this image and copyright information in PMC

References

    1. Krzyszczak A., Czech B. Occurrence and Toxicity of Polycyclic Aromatic Hydrocarbons Derivatives in Environmental Matrices. Sci. Total Environ. 2021;788:147738. doi: 10.1016/j.scitotenv.2021.147738. - DOI - PubMed
    1. Zhang X., Yang L., Zhang H., Xing W., Wang Y., Bai P., Zhang L., Hayakawa K., Toriba A., Wei Y., et al. Assessing Approaches of Human Inhalation Exposure to Polycyclic Aromatic Hydrocarbons: A Review. Int. J. Environ. Res. Public Health. 2021;18:3124. doi: 10.3390/ijerph18063124. - DOI - PMC - PubMed
    1. Desler C., Johannessen C., Rasmussen L.J. Repair of DNA Damage Induced by Anthanthrene, a Polycyclic Aromatic Hydrocarbon (PAH) without Bay or Fjord Regions. Chem. Biol. Interact. 2009;177:212–217. doi: 10.1016/j.cbi.2008.10.056. - DOI - PubMed
    1. Munoz B., Albores A. DNA Damage Caused by Polycyclic Aromatic Hydrocarbons: Mechanisms and Markers. Sel. Top. DNA Repair. 2011;201:125–143. doi: 10.5772/22527. - DOI
    1. Scheurer M.E., Danysh H.E., Follen M., Lupo P.J. Association of Traffic-Related Hazardous Air Pollutants and Cervical Dysplasia in an Urban Multiethnic Population: A Cross-Sectional Study. Environ. Health Glob. Access Sci. Source. 2014;13:52. doi: 10.1186/1476-069X-13-52. - DOI - PMC - PubMed