Jennifer Stowell, Emory University, Department of Environmental Health Sciences, Atlanta, GA, United States, Jianzhao Bi, Emory University, Atlanta, GA, United States, Mohammad Z. Al-Hamdan, Universities Space Research Association at NASA/MSFC, Huntsville, AL, United States, Hyung Joo Lee, California Environmental Protection Agency Air Resources Board, Sacramento, CA, United States, Sang-Mi Lee, South Coast Air Quality Management District, Diamond Bar, CA, United States, Frank Freedman, San Jose State University, San Jose, CA, United States, Patrick Kinney, Boston University School of Public Health, Boston, United States and Yang Liu, Emory University, Department of Environmental Health, Atlanta, GA, United States