A one-day geography field study for S.5 students this year was successfully held on 21st January 2013. This year students had their field studies camp in Tsuen Wan and focused on the study on sustainable city. Other than having an enjoyable period of time in the field trip study, students have managed to collect and analyze the data of air quality such as suspended particulars and carbon dioxide in Tsuen Wan city centre. It is also a chance for our students to learn through application of geographical theories that they learnt in class.