| Date  | Visiting Scholar  | Affiliation  | Activities  | 
              
                | Nov. 3, 2003  | Dr. Jason Ching  |  NOAA/EPA | Seminar speaker, visiting AQFL, discussions on future collaborations  | 
              
                | Jan. 25-27, 2004  | Dr. Georg Grell  | NOAA/FSL  | Seminar speaker, visiting AQFL, dinner with Dr. Zhang, discussions on future collaborations, visit at EPA  | 
              
                | Apr. 25-26, 2004  | Dr. Thanos Nenes  | Georgia Tech  | Seminar speaker, visiting AQFL, dinner with Dr. Zhang, discussions on future collaborations  | 
              
                | Nov. 15, 2004  | Mr. Ken Schere  | NOAA/EPA  | Seminar speaker, visiting AQFL  | 
              
                | Nov. 22, 2004  | Dr. Simon Clegg  |  University of East Anglia, Norwich  | Seminar speaker, discussions on future collaborations  | 
              
                | March 21, 2005  | Mr. Eric  Edgerton | ARA, Inc.  | Seminar speaker, visiting AQFL, discussions on future collaborations  | 
              
                | May 27, 2005  | Prof. Wenxing Wang (A prestigious member of Chinese Academy of Sciences)
 |  Chinese Research Academy of Environmental Sciences, PRC  | Visiting AQFL, Discussions on future collaborations  | 
              
                | Sept. 9-11, 2005  | Dr. Makoto Koike  | The University of Tokyo, Japan  | Visiting AQFL, dinner with AQFL group members, discussions on future collaborations  | 
              
                | Oct. 3-4, 2005  | Dr. Mark Jacobson  |  Stanford University  | Seminar
speaker, lunch with AQFL group members, dinner with Dr. Zhang,
discussion on ongoing collaborative projects, visit at EPA  | 
              
                | Oct. 24, 2005  | Mr. Tom Pierce     | NOAA/EPA  | Seminar speaker, visiting AQFL  | 
              
                | Nov. 23, 2005- Jan. 18, 2006  | Mr. Naga Oshima  | The University of Tokyo, Japan  | Visiting AQFL, Incorporation of a module for black carbon in CMAQ-MADRID  | 
			  
                | April 15- 30, 2006  | Dr. Jiming Hao 
(A prestigious member of Chinese Academy of Sciences)
 |  Tsinghua University, Beijing, China |  Seminar speaker, visiting AQFL, and discussions on future collaborations with Dean Solomon, PAMS and Dr. Zhang, MEAS/AQFL.  | 
			  
                |  Jan.-July, 2006  |  Dr. C. Russell Philbrick  |  Penn State University, on sabbatical at NCSU, Spring, 2006  |  Seminar speaker, guest lecturer, visiting AQFL, and discussions on future collaborations with Dr. Zhang and AQFL members.  | 
			    
			      | Aug. 16-17, 2006 | Dr. Darrel Baumgardner | Universidad Nacional Autónoma de México | Two seminars, visiting AQFL and EPA. Discussed future collaborations with Dr. Zhang | 
			    
			      | Sept. 18, 2006 | Dr. Sharon Zhong | Michigan State University | Seminar speaker, visiting AQFL. Discussed future collaborations with Dr. Zhang. | 
			    
			      | Oct. 23, 2006 | Dr. William R. Stockwell | Howard University | Two seminars, visiting AQFL. Discussed future collaborations with Dr. Zhang. | 
			    
			      | Dec. 1, 2006 | Dr. Prakash Bhave | NOAA/EPA | Seminar speaker, visiting AQFL. | 
			    
			      | Dec. 21, 2006 | Dr. Tao Wang | The Hong Kong Polytechnic University | Seminar speaker, visiting AQFL. Will discuss potential collaboration with Dr. Zhang. | 
				   
				     | Mar. 18-19, 2007 | Dr. Jose Fuentes | University of Virginia | Seminar speaker, visiting AQFL, discussed future collaborations with Dr. Zhang. | 
				   
				     | Jun. 6-Nov. 5, 2007 | Dr. Litao Wang | Tsinghua University | Visiting AQFL, collaborate on air quality modeling and assessment in China, and seminar speaker. | 
				   
			      | May 14, 2007 | Dr. David Streets | Argonne National Laboratory | Seminar speaker, visiting AQFL, discussed collaborative project with Dr. Zhang. | 
				   
				     | Jul. 12-Aug. 17, 2007 | Mr. Jie Chen | Zhejiang University | Visiting AQFL for summer research, and seminar speaker | 
                   
				     | Jan.11, 2008-Mar.31, 2009 | Ms. Xiao-Huan Liu | Shandong University | Visiting AQFL for Ph.D thesis research | 
                   
				     | Mar.31, 2008-Mar.30, 2009 | Ms. Shu-hui Cheng | Shandong University | Visiting AQFL for Ph.D thesis research | 
                    
				     | July 7- August 15, 2008 | Mr. Shaojun Zhang | Tsinghua University | Visiting AQFL for summer research, and seminar speaker | 
                   
                      | Aug.18, 2008-Jan.17, 2009 | Mr. Jia Xing | Tsinghua University | Visting AQFL for Ph.D thesis research | 
                    
                      | July 1-August 7, 2009 | Mr. Bin Zhao | Tsinghua University | Visiting for AQFL Summer Research | 
                    
                      | Sept. 13- Oct. 2, 2009 | Mr. Carlos Ochoa | Universidad Nacional Autónoma de México | Mexico, Visiting AQFL for collaborative research, and seminar speaker | 
                    
                      | Sept.1, 2010-Aug.31, 2011 | Ms. Xuyan Liu | Tsinghua University | Visiting AQFL for Ph.D thesis research | 
                                       
                      | Dec 5, 2010-Dec 5, 2011 | Mr. Wei Wang | Institute of Atmospheric Physics, Chinese Academy of Science | Visiting AQFL for Ph.D thesis research | 
                                       
                                         | Feb 9-24, 2011 | Dr. Naga Oshima | the Meteorological          Research          Institute, Japan Meteorological Agency | Visiting AQFL for a new collaborative project | 
                                       
                                         | Sept. 1-Nov. 28, 2012 | Prof. Qi Fan | Sun yat-sen University, China | Visiting AQFL for research | 
                                       
                                         | Dec. 8 2012 - June 2013 | Mr. Bo Zheng | Tsinghua University | Visiting AQFL for Ph.D thesis research | 
                                       
                                         | Feb.1 2013 - Jan.31 2014 | Mr. Xin Li | Tsinghua University | Visiting AQFL for Ph.D thesis research | 
| August 25 2015 - Present | Mr. Hong Chaopeng | Tsinghua University | Visiting AQFL for Ph.D thesis research | 
| August 25 2015 - Present | Dr. Song Hongquan | Peking University | Visiting AQFL for collaborative research | 
| August 25 2015 - Present | Mr. Xiao Feng | Peking University | Visiting AQFL for Ph.D thesis research | 
| May - July 2016 | Mr. Angel Liduvino Vara-Vela | University of Sao Paulo | Visiting AQFL for AQ Modeling | 
| January 27 - April 30, 2017 | Mr. Mario Eduardo Gavidia Calderon | University of Sao Paulo | Visiting AQFL for AQ Modeling over Brazil | 
| December 18, 2017 - December 17, 2018 | Dr. Syuichi ITAHASHI | Central Research Institute of Electric Power Industry | Visiting AQFL for AQ Modeling over Japan and U.S. | 
| February 20, 2018 - February 13, 2019 | Dr. Haijiang Kong | Henan Bureau of Meteorology | Visiting AQFL for AQ Modeling over China | 
| May 14, 2019 - Nov 1, 2019 | Ms. Ruili Wu | Tsinghua University | Visiting AQFL for INMAP Application over China |