Non-exhaust emissions (tyre-wear particles, TWP; brake-wear particles, BWP; road dust) are a major urban pollution source as exhaust declines. These heterogeneous particles contain metals, minerals, carbonaceous material, polymers, organics and micro-/nanoplastics; their behavior cannot be understood from emission composition alone.
During transport, deposition and resuspension, they undergo multi-stressor ageing (precipitation, drying, UV, temperature, freeze–thaw, oxidation, interactions with salts, organic matter and particles). Ageing alters morphology, size, surface chemistry, mineralogy, magnetic properties, aggregation, mobility and reactivity, modifying signatures and environmental fate. TWP and BWP are chemically and mineralogically complex. Constituents transform, dissolve, oxidise, fragment, aggregate and interact with natural minerals, affecting transport, resuspension, deposition and transfer between compartments. The session focuses on post-emission evolution of non-exhaust particles, coupling composition, ageing, mineral transformations and mobility.
We welcome studies addressing:
• quantification of non-exhaust particles in the atmosphere;
• source apportionment via multivariate statistics and modelling, including signature changes;
• shifting traffic source signatures;
• health impacts and risk assessment of fresh vs aged particles, including bioavailability;
• generation and composition of BWP, TWP and road dust;
• inorganic constituents of BWP/TWP;
• environmental ageing under UV, oxidation, humidity, temperature, wetting–drying and freeze–thaw;
• changes in size, morphology, surface chemistry, aggregation and stability;
• mineral transformations, dissolution, oxidation and secondary mineral formation;
• mineral, elemental and magnetic signatures as tracers and their relevance through time;
• environmental magnetism identifying Fe-bearing components;
• interactions and heteroaggregation of TWP/BWP with minerals, metals, organics and micro-/nanoplastics;
• resuspension, transport and deposition of fresh/aged particles;
• transfer to soils, runoff, surface waters and sediments;
• changes in particle reactivity, mobility, persistence and bioavailability;
• lab experiments, field observations and modelling linking transformation with fate;
• advanced analytical approaches combining mineralogical, magnetic, spectroscopic, microscopic, thermal and geochemical methods.