August 14, 2025Scientific ReportsOpen Access

Changes in water quality condition at sequential monitoring stations based on IRWQI along the Little Zab River in Northwestern Iran

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Assessment reveals spatial and temporal variations in water quality using IRWQI at four stations, indicating significant pollution sources.

Water quality varies significantly across monitoring stations along the Little Zab River, declining downstream due to pollution.
The Iranian water quality index (IRWQI) shows the upstream station with the lowest score (56.51), affected by wastewater discharge.
Assessment using non-parametric tests uncovered declines and improvements in water quality across the monitoring period from 2015 to 2024.
These findings highlight the need for targeted pollution control measures to protect river health and improve water quality.

Irani et al. (2025) studied this question.

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Assessment reveals spatial and temporal variations in water quality using IRWQI at four stations, indicating significant pollution sources.