Regional aerosol transport and vertical mixing: factors contributing to an air pollution event in a highly urbanized Andean valley - G. Alexis Ayala-Parra; K. Santiago Hernández; Camilo A. Chalán; Mauricio Ramírez; Manuel D. Zuluaga; Lina I. Ceballos; J. Alejandro Martínez (Atmospheric Research, 2026)