Analysis of elemental concentrations of particle matter samples collected in a tunnel and in a background site in Lisbon, Portugal (Metadata RADIATE TA Proposal 20002192-ST)

Proposal title "Analysis of elemental concentrations of particle matter samples collected in a tunnel and in a background site in Lisbon, Portugal". Measurements carried out at the external beam set-up for atmospheric aerosol analysis of the INFN LABEC accelerator laboratory), from 9 till 10 September 2020. Hands-off mode.

Vehicle emissions are one of the main sources of air pollutants, being the second largest contributor to PM2.5 and black carbon in cities. Road transport emissions include exhaust emissions resulting from combustion and non-exhaust emissions. Several technologies have been introduced to vehicles to achieve lower emissions and meet the increasingly stringent emissions standards. However, the knowledge about the sources fingerprints of vehicles in the real-world driving is scarce for Europe and Portugal.<br>
A sampling campaign was carried out in October 2019 in Lisbon, Portugal, for one week, in order to measure the roadway emissions of Particulate Matter (PM) from in-use fleets in road tunnels, which include a mixture of emissions from tailpipes, brake and tire debris by passing vehicles.

About 90 samples of PM10-2.5 (coarse fraction) and PM2.5 (fine fraction) atmospheric aerosol sampled in an urban background site and inside a road tunnel in Lisbon for one week and collected on polytetrafluoroethylene filters (for the fine fraction) and polycarbonate filters (for the coarse fraction) were analyzed by PIXE technique using an extracted proton beam of 3.0 MeV (energy on target) to determine the elemental composition, and then to determine source profiles and to update the European emission inventories. A set of elemental standards and an aerosol reference standard (NIST 2783) were analysed as well for quality assurance purposes and to check the accuracy of quantitative results.