Yunyao Li, The University of Texas at Arlington, Arlington, United States, Daniel Tong, George Mason University, Department of Atmospheric, Oceanic & Earth Sciences, Fairfax, United States, Peng Xian, Naval Research Laboratory, Monterey, United States, Kevin Cromar, New York University, NYU Grossman School of Medicine, New York, United States, Barry Baker, NOAA Air Resources Laboratory, College Park, United States, Ravan Ahmadov, NOAA Global Systems Laboratory, Boulder, United States, Anton Darmenov, NASA Goddard Space Flight Center, Greenbelt, United States, Edward J Hyer, Harvard-Smithsonian CFA, Cambridge, United States, Daniel Figueras, Environment and Climate Change Canada, Dorval, Canada and Jack Chen, Environment and Climate Change Canada, Air Quality Research Division, Ottawa, ON, Canada