Rampant use of prohibited synthetic materials and toxic paints in idols led to manyfold increase of heavy metal concentration in the Yamuna following idol immersion, a monitoring committee overseeing the cleaning of the river said.
After being apprised by the Central Pollution Control Board (CPCB) that idol immersion following Ganesh Chaturthi and Durga Pooja, and religious activities during Chhat Pooja cause extensive damage to the river, the panel said it "unacceptable and dangerous".
The monitoring committee has said the Yamuna is "fighting to stay alive" and it would not be possible to rejuvenate the river unless minimum environmental flow is provided as it is "virtually reduced to a trickle and remains dry in some stretches for almost nine months of the year".
The panel has proposed legal action and imposition of heavy fine against those violating the norms that led to pollution in the river.
Toxicity of heavy metals can damage functioning of brain, lungs, kidney, liver and other vital organs and also can alter blood composition. Long-term exposure can lead to ailments such as multiple sclerosis, Parkinson's disease, Alzheimer's disease and muscular dystrophy, among others
The monitoring committee, formed by the National Green Tribunal (NGT), noted that concentration of heavy metals increased in the river due to immersion of painted and polished idols with metallic ornaments and shiny materials.
Post-immersion, the level of chromium increased 11 times from the limit (0.05mg/l) set by the Bureau of Indian Standards (BIS), while iron concentration increased 71 times from the 0.3 mg/l limit. Nickel increased one fold from the 0.02 mg/l BIS limit and lead increased two times from the 0.01 mg/l limit, the CPCB said.
The quality of the river water after idol immersion following Ganesh Chaturthi showed "unacceptable rise of levels of pollutants", the monitoring committee said, adding, "There is an urgent need to build awareness about how dangerous this can be and to show no latitude when CPCB guidelines are being defied."
According to researchers, toxicity of heavy metals can damage functioning of brain, lungs, kidney, liver and other vital organs and also can alter blood composition. Long-term exposure can lead to ailments such as multiple sclerosis, Parkinson's disease, Alzheimer's disease and muscular dystrophy, among others.
CPCB guidelines state that idols should be made from natural materials and clay should be used while backed clay, plaster of paris and other such items should not be allowed.
"If idols are to be painted, water-soluble non-toxic natural dyes should be used. Use of toxic and non-biodegradable chemical dyes for painting idols should be strictly prohibited," the guidelines said.
NGT Chairperson Justice AK Goel had in July formed the monitoring committee comprising retired expert member BS Sajwan and former Delhi chief secretary Shailaja Chandra, and directed them to the submit an action plan and detailed report on cleaning of the river by December 31.
The committee has directed the divisional commissioner, NCT Delhi authorities an other public authorities like DMC, DDA, CPCB and DPCC to ensure that a system is established for giving registration, getting undertaking to abide by the CPCB guidelines before granting approval to pooja pandals.
"If use of prohibited material is noted on random inspection, the pandals, societies who have given an undertaking would need to be fined heavily besides taking other legal action for causing nuisance," the monitoring committee recommended.
It also emphasised on raising public awareness about the issue and make people understand why it is important to desist from using paints, plaster of paris, while at the same time ensure that synthetic material is not thrown in the river.