On October 19-27th, three of us (Zhizhen, Yangzhi and Gan) visited Pakistan , with the purpose of promoting and discussing air pollution research collaborations between the two sides.   Gan gave lectures in six universities,  including GC University of Faisalabad, Sargodha University, Punjab University, COMSATS University, Quaid-a-Azim University, National University of Science and Technology; and also visited the Confucius College （孔子学院）of Faisalabad Agricultural University. We were high welcome in all the visited places, and Shizhen was always surrounded by students and local people asking for taking pictures together. We had a day trip to Muree to the north of Islamabad to see the mountains of Kashmir Himalayas.  We were also happy to meet Professor Riffat and Ali Syed who visited us in Guangzhou several and many years ago, respectively.  It is a very memorable trip and we can feel the ironic friendship between people of the two countries!