Evaluation of variation in water quality of Hindon river using Water Quality Index (WQI) and Overall Index of Pollution (OIP) along its upstream to downstream region in western Uttar Pradesh. - Kumar, Devendra; Tyagi, Hariom; Rai, Swapnil; Dwivedi, Kuldeep; Sharma, Arun Kumar; Bhardwaj, Laxmi Kant (Journal of Applied & Natural Science, 2026)