Metallic Trace Elements Shipping Profile by PM1 Source Apportionment in a Mediterranean PortCity

International audienceShipping emissions in ports can have substantial impacts on air quality and population health in the nearby urbanenvironment. Legislative efforts made in recent years have reduced emissions of some gaseous pollutants but theaerosol chemical composition, in particular metals composition in submicronic fraction, is little documented.More than 30 trace metals have been monitored with two online metals analysers (Xact 625i) in addition to regulatedpollutants (PM2.5, PM10, NOX, O3 and SO2) and ultrafine particle number during two intensive campaigns in Marseille(France) in the summer 2021. Samples were taken simultaneously along the port berths and on the urban backgroundaerosol site MRS-LCP located 2 km from the port. As the second largest city of France, Marseille represents achallenging environment for source apportionment (SA), as it combines multiple anthropogenic sources includingintensive traffic and various industrial activities in addition to shipping.This work presents the SA analysis performed on trace elements using Positive Matrix Factorization (PMF) resolvedwith the multilinear engine approach (SoFi Pro) on both sampling sites.Inside the port area, the half hourly metals measurements allowed to define a “shipping” profile by SA analysis. Thisprofile is dominated by Vanadium (V) and Nickel (Ni) and is associated with ultrafine particles (Dmob