Due to a rise in inflow of floodwaters, the water quality in the Yamuna has improved significantly. The improvement is largely due to the increased oxygen content of the water which cleanses the river and helps keep pollutants in check, experts have said.
The river is at its "healthiest" state this year yet, they added.
Yamuna passes through Uttarakhand, Haryana, Delhi, and Uttar Pradesh. It merges with the Ganga at Allahabad.
However, the river has earned the unpleasant distinction of being one of the most polluted rivers in the country.
But experts said the quality of water has improved in the last two days due to increased flow. Experts also highlighted that the water quality improves every year during monsoon, when the river flow improves.
Manoj Mishra, the convener of the Yamuna Jiye Abhiyaan, termed the improvement as a "temporary effect which would go with the monsoon season".
"The quality of Yamuna water is at its healthiest state this year yet but that is due to the better water flow. Any water that is flowing always has better quality as it has increased oxygen content which cleanses the water and also prevents further pollution," he said.
He highlighted the need to maintain the healthy state of the river.
"There is a need to maintain environmental flow at Hathini Kund Barrage to ensure that the aquatic flora and fauna flourish as they are dependent upon the environmental flow," he said.
The experts said that the temporary healthy state of Yamuna would subside after the monsoon season and sewage water would again pollute the river if steps are not taken to prevent its contamination.
(With inputs from PTI)