Yong Jie WongYoshihisa ShimizuKai HeNik Meriam Nik Sulaiman2024-05-202024-05-202020Wong, Y. J., Shimizu, Y., He, K., & Nik Sulaiman, N. M. (2020). Comparison among different ASEAN water quality indices for the assessment of the spatial variation of surface water quality in the Selangor river basin, Malaysia. Environmental monitoring and assessment, 192, 1-16.https://repoemc.ukm.my/handle/123456789/1578The assessment of surface water quality is often laborious, expensive and tedious, as well as impractical, especially for the developing and middle-income countries in the ASEAN region. The application of the water quality index (WQI), which depends on several independent key parameters, has great potential and is a useful tool in this region. Therefore, this study aims to find out the spatial variability of various water quality parameters in geographical information system (GIS) environment and perform a comparative study among the ASEAN WQI systems.enASEANWater quality indexSpatial analysisSelangor river basinJournal