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Size-segregated studies of organic and elemental carbon (EC, OC) in aerosol is essential in understanding sources and effects on the environment. However, these studies are scarce , especially in coastal areas stressed by anthropogenic emissions and with interactions between anthropogenic and natural emissions. To partially fill this lack of information, aerosol siye segregated samples were takrđen between August 2018 and May 2019, using a MOUDI impactor. A thermal-optical analysis (EUSAAR2) allowed EC and OC determination in different size ranges. For Rijeka site, the water soluble organic carbon content (WSOC) was analysed. OC and EC average concentrations in Venice were 3.16 (± 0.97) and 0.40 (±0.13) μg/m3 in Rijeka were 2.48 (± 0.65) and 0.37 (±0.08) μg/m3. The OC size distributions were bimodal at both sites, with an accumulation mode in the size range 0, 56-0, 32 μm, a coarse mode in the range 5.6-3.2 μm . EC showed a bimodal distribution in Rijeka, a single fine mode in Venice. The EC/TC ratio was large in the fine mode at both sites , however, in Rijeka non-negligible values were found in. coarse fractions, suggesting contributions from resuspensions od carbon loaded dust and mixing of anthropogenic particles with sea spray.. The WSOC/OC analysis as function of particle size in Rijeka showed a total value of 0.51 (± 0.12) with an increase in the coarse fraction likely due to a contribution of water soluble carbon from sea spray and f biogenic emissions.

This work presents an analysis of the impact of ship emissions to atmospheric particle concentrations (PM) in four important port- cities (Patras Greece, Brindisi and Venice Italy, and Rijeka Croatia) of the Adriatic/ Ionian area. The study was performed within the POSEIDON project (Pollution monitoring of ship emissions: an integrated approach for harbours of the Adriatic basin, funded within the MED Programme 2007-2013). The study uses an integrated approach using emission inventories, dispersion modelling and measurements taken at high temporal resolution (1 min) and low temporal resolution for chemical characterization of PM. The emission inventories of the four port-cities show that shipscontribute between 11.7% and 31.0% of the total PM emissions being a source locally comparable with road traffic (ranging between 11.8% and 26.6%). The source apportionment using the receptor model PMF showed an oil combustion source (that includes ship emissions), characterized by V and Ni, in Brindisi, Venice and Rijeka with V/Ni ratio ranging between 1.4 and 4.2 indicating local differences in chemical profiles of the emissions.The V concentrations were used to evaluate the contributions of primary ship emissions to PM that resulted between 1.3% and 2.8%

Emissions of atmospheric pollutants from ships and harbour activities are a growing concern at international level given their potential impacts on air quality and climate. These close-to-land emissions have potential impact on local communities in terms of air quality and health. Recent studies show that the impact of maritime traffic to atmospheric particulate matter concentrations in several coastal urban areas is comparable with the impact of road traffic of a medium size town. However, several different approaches have been used for these estimates making difficult a direct comparison of results. In this work, an integrated approach based on emission inventories and dedicated measurement campaigns has been applied to give a comparable estimate of the impact of maritime traffic to PM2.5 and particle number concentrations in three major harbours of the Adriatic/Ionian Seas. 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T06A195P

Atti curati da F. Forget, M.A. Lopez-Valverde, M.C. Desjean, J.P. Huot, F. Lefevre, S. Lebonnois, S.R. Lewis, E. Millour, P.L. Read e R.J. Wilson