CERI EE at the Scientific Meeting of CDP AREA

The day opened with a plenary lecture by Prof. Jurgita Ovadnevaite (University of Galway), focusing on advances in aerosol mass spectrometry. Her presentation emphasized the key role of these instruments in characterizing, in near real time, the chemical composition of atmospheric particles and identifying their sources.

The contributions of CERI EE were particularly visible throughout the different thematic sessions. Within WP1, dedicated to identifying particle sources, two presentations addressed issues related to urban and road emissions. Soatoavina Randrianomenjanahary (CERI EE, LOA) presented work conducted on the ATOLL experimental platform aimed at identifying sources of ultrafine particles. Antoine Roose (CERI EE) examined the contribution of asphalt and tire wear to non-exhaust road emissions.

WP2 also featured a joint contribution involving CERI EE. Emilie Chantraine (PC2A, CERI EE) presented her work combining laboratory studies and field observations to better understand the processes leading to ozone and ultrafine particle formation in urban environments.

In WP3, dedicated to large-scale aerosol trends and impacts, Anna Font presented an analysis of recent changes inPM_2.5 concentrations in rural environments across mainland France. Her study questions the ability of regional background monitoring stations to capture variations in primary emissions at the national scale, thereby contributing to the evaluation of air pollution reduction policies.

Finally, the poster session provided an additional showcase for CERI EE research. Several studies focused on atmospheric chemistry and interactions between pollutants and materials, including:

• Measurement of the oxidative potential of secondary organic aerosols (METRONOME project). Thomas Audoux
• Estimation of the contribution of agriculture to nitrogen-containing atmospheric aerosols (CAPARA project). Sauryadeep Mukherjee
• Unraveling Formaldehyde Uptake on Microplastics and Indoor Materials: Experimental Findings. Subhadarsi Nayak
• Atmospheric Fate of Ketolimonene: Reaction Kinetics, Highly Oxygenated Molecules (HOMs), and Secondary Organic Aerosols (SOAs) Formation from NO₃-Initiated Oxidation. Sandy Solaiman
• VOC Emissions from Asphalt Pavements under Urban-Relevant Temperatures and UV Radiation: Role of Ageing and Formulation. Darya Urupina
• Uptake of HCl on minerals of interest for Stratospheric Injection: a Knudsen cell study. Anaïs Lostier

Through these various contributions, CERI EE demonstrated the diversity of its approaches, combining experimental measurements, field observations, and modeling to better understand atmospheric processes and their impacts on air quality and climate.