Isobel J Simpson¹, Donald Ray Blake¹, Barbara Barletta¹, Simone Meinardi¹, Nicola J Blake¹, Tao Wang², Lingxiao Yang³, Elizabeth A. Stone⁴, Robert J Yokelson⁵, Muhammad Akhyar Farrukh⁶, Omar Siraj Aburizaiza⁷, Haider Khwaja⁸, Azhar Siddique⁹, Jahan Zeb¹⁰, Jung-Hun Woo¹¹, Younha Kim¹¹, Glenn S Diskin¹² and David A Peterson¹³, (1)University of California Irvine, Irvine, CA, United States, (2)Hong Kong Polytechnic University, Department of Civil and Environmental Engineering, Hong Kong, China, (3)Shandong University, Environment Research Institute, Jinan, China, (4)University of Iowa, Iowa City, IA, United States, (5)University of Montana, Department of Chemistry, Missoula, MT, United States, (6)Forman Christian College, Lahore, Pakistan, (7)King Abdulaziz University, Jeddah, Saudi Arabia, (8)University at Albany, Department of Environmental Health Sciences, Albany, NY, United States, (9)Ministry of Public Health, Doha, Qatar, (10)Umm al Qura University, Department of Environment and Health Research, Mecca, Saudi Arabia, (11)Konkuk University, Seoul, South Korea, (12)NASA Langley Research Ctr, Hampton, VA, United States, (13)Naval Research Laboratory, Monterey, United States