Monday, 13 January 2025: 9:15 AM
229 (New Orleans Ernest N. Morial Convention Center)
Georgios I. Gkatzelis, Forschungszentrum Jülich GmbH, Jülich, Germany; and Y. Wu, R. Tillmann, A. Novelli, M. M. Coggon, M. Roska, E. Y. Pfannerstill, C. Stockwell, K. Bates, M. Riva, J. Fry, A. Grasse, A. Nissinen, A. Prevot, A. Baccarini, A. Lara, A. Buchholz, A. Zanders, A. Voliotis, A. Blaser, A. Kumar, B. Winter, B. Bohn, B. Yang, C. Warneke, C. Wesolek, D. Bell, D. Worsnop, E. D. Pusfitasari, E. Matthews, M. Färber, F. R. Nursanto, F. Partovi, F. Rohrer, G. McFiggans, H. Fuchs, H. Coe, H. Wang, I. Pullinen, I. El Haddad, J. Top, L. Liu, L. Kesper, M. Canagaratna, M. Leiminger, M. Müller, M. Graus, M. Rissanen, M. Alton, N. Vinkvist, N. Dudani, P. Khare, Q. He, R. Asger, R. Dubus, R. Wegener, S. Farhoudian, S. Takahama, S. Perrier, S. Wedel, S. Barua, S. Iyer, S. Schobesberger, S. Van de Wouw, S. R. Zorn, S. S. Brown, T. J. Bannan, T. Hohaus, T. Reinecke, Y. Chen, Y. Wang, Y. Wang, and A. Wahner
Urban pollution poses one of the largest threats to human health worldwide. A significant portion of this pollution is secondary, formed through atmospheric chemical reactions of emitted trace gases, with secondary organic aerosol (SOA) and ozone (O₃) being major contributors to health impacts in urban areas. While decades of air quality regulations have significantly reduced motor vehicle emissions of organic compounds that act as precursors to secondary pollution, recent focus has shifted to understudied urban sources such as volatile chemical products and cooking emissions. These sources are challenging to replicate in chamber experiments, which typically focus on single-compound scenarios, thus limiting their comparability to real-world urban environments.
In this study, we present a comprehensive chamber campaign aimed at quantifying the impact of various urban emission sources—including gasoline, diesel, cooking, and volatile chemical products—on SOA and O₃ formation. By utilizing emission inventories, we generated chemical fingerprints representing 80% of the overall reactivity and SOA formation potential of each source. These fingerprint solutions were then injected into the atmospheric simulation chamber SAPHIR to explore their potential for secondary pollution formation. Leveraging the unique features of the SAPHIR chamber, such as its low surface-to-volume ratio and exposure to natural sunlight, we deployed state-of-the-art instrumentation to capture the chemical composition and volatility of gas- and particle-phase components. We conducted experiments simulating each source at various NOx exposures, as well as mixed systems to simulate the urban atmosphere of US and European cities. Finally, we contextualize our findings by comparing them with data from the Atmospheric Emissions and Reactions Observed from Megacities to Marine Areas (AEROMMA) mission, offering insights into the dynamics of urban air pollution.
- Indicates paper has been withdrawn from meeting
- Indicates an Award Winner
