Air quality is a global public health challenge with regionally-specific drivers and control strategies. Variations in meteorology and climate coupled with emission source types and atmospheric chemical processes lead to diverse air quality impacts at regional scale. This session solicits submissions from observational and modeling studies on air pollution in different regions around the world. Observational studies that include remote sensing, in-situ measurements, analysis from recent field intensives or a combination of these approaches are encouraged. Laboratory studies of important atmospheric chemical processes and progress toward the development of chemical mechanisms are also of interest. Modeling studies that use observations and laboratory data to improve predictive skills of air quality are welcome. Relevant air quality issues include, but are not limited to, near-surface ozone, fine particles, hazardous air pollutants, emerging/understudied pollution sources, smoke from wild and prescribed fires, visibility, regional haze, air quality-climate interactions, emissions and trends, and inequities in pollutant exposure and health impacts.

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