In this study, PUF disk passive air samplers were deployed at eight sites, during two sampling periods, on the Island of Sicily in the Mediterranean basin. Samples were screened for a number of persistent organic pollutants (POPs) including polychlorinated biphenyls (PCBs) (n = 28 congeners), organochlorine pesticides (OCPs) (n = 16 compounds), and polybrominated biphenyl ethers (PBDEs n = 28) using GC-MS. PCB concentrations in air ranged ~10-300 pg m-3. The PCB pattern was dominated by lower to middle molecular weight PCBs (Cl3-5) and PCB-28 and PCB-52 were the most abundant congeners. α- and γ-Hexachlorocyclohexanes (HCHs) concentrations in air were relatively high ~420 ± 320 (50-1000) and 460 ± 340 (30-1000) pg m-3, respectively, with an average α/γ ratio of 1 ± 0.5, indicating a tendency of higher use of lindane than of technical HCH. Among DDTs, only p,p'-DDT 90 ± 15 (~10-800) and p,p'-DDE 60 ± 60 (20-400) were frequently detected. DDT/DDE = 0.4-3.0 (1.0 ± 0.7 for both periods) suggesting past and fresh inputs of DDT at the sampling sites. α-Endosulfan, recently included in Annex A of the Stockholm Convention, fluctuated between 120 ± 50 (50-1000) pg m-3. In contrast, PBDE levels were very low (0.2-2 pg m-3). Back trajectories of advection suggest that POP levels are mainly related to local sources (primary or secondary) from Sicily (50-70 % contribution of air masses), Southern Italy, and Sardinia (20 %). This study provides new information for POP levels in the atmosphere of the Mediterranean region.

Centro de Investigación en Biodiversidad y Ambientes Sustentables Universidad Católica de la Santísima Concepción Alonso de Ribera 2850 407 01 29 Concepción Chile

Dipartimento della Scienza della Terra e il Mare Universitá degli Studi di Palermo Pleasso di Viale delle Scienze Edificio 16 Palermo Italy

Dipartimento Scienze fisiche della Terra e dell'ambiente Universitá degli Studi di Siena Via Mattioli 4 53100 Siena Italy

Facultad de Ciencias Universidad Católica de la Santísima Concepción Alonso de Ribera 2850 407 01 29 Concepción Chile

Faculty of Science Research Centre for Toxic Compounds in the Environment Masaryk University Kamenice 753 5 625 00 Brno Czech Republic

Istituto per la Ricerca Scientifica e Tecnologica Applicata al Mare Via dei Mille 44 98057 Milazzo Italy

Multiphase Chemistry Department Max Planck Institute for Chemistry Mainz Germany

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