Pollution in Yamuna refuses to come down despite efforts by the Delhi government and various agencies to reduce the contamination levels in the river.
The sorry picture once again came to the fore recently when Delhi Jal Board officials stumbled upon some "mystery" pollutants which are found to be deteriorating the water quality of the river to a dangerous level.
The rise in levels of cyanotoxins and other unidentified pollutants found in Yamuna may pose severe health risks.
The unidentified pollutants were discovered during a disinfection drive by the Jal Board in the river.
By their own admission, Jal Board officials don't have the necessary technology to find out the origin of these contaminants, which may pose severe health risks to humans.
The Jal Board scientists, who conducted a water chlorination study, said heavy doses of chlorine would be required to decontaminate these pollutants.
They claimed to have found several unidentified by-products in the river water, which form when chlorine reacts with ammoniacal contaminants and cyanobacterial bloom. This also suggests the presence of cyanobacterial bloom in Yamuna, exposure to which poses severe health risks to humans.
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