This study aims to compare the acid rain changes in three cities including Quang Ngai, Nha Trang and Da Lat, which are different in both weather conditions and industrial development. A set of combined data on the characteristics of both rain water and meteorology for the last ten years was employed for assessment. | A relative comparison of acid rain quality changes in Quang Ngai, Nha Trang and Da Lat during 2007 – 2016