New satellite instruments and remote sensing techniques are enabling advances in spatial, temporal, and vertical characterization of air quality. The Sentinel-5 Precursor mission, launched in 2017, provides spectacular products due to its unprecedented high sensitivity and spatial resolution. GEMS, the first component of the geostationary air quality-observing constellation, launched February 2020 and will be joined by TEMPO and Sentinel-4 in 2022 and 2023, respectively, extending to GEO-XO in the following decade. Maximizing the science, applications, and societal benefit from these new capabilities requires integration with other measurements and advanced modeling frameworks. We invite submissions related to these advances, including but not limited to:

• Satellite mission results, status, and validation strategies
• Aerosol and trace gas retrievals advances
• Harmonizing data products from multiple platforms
• High spatiotemporal modeling and/or surface observations
• Data assimilation and inverse methods
• Boundary layer characterization and relationship to near-surface pollution
• Field campaigns prototyping future space-based capabilities