A bench headed by NGT chief Justice Swatanter Kumar directed the apex pollution monitoring body to file a detailed report in this regard including the "acceptable" grade of manja before February 16, the next date of hearing.
It also asked CPCB to submit whether nylon thread of any ply, which is claimed to be biodegradable, is degradable or not and prescribe what standards of "tensile strength, thickness or other parameters should be recommended for manja".
The tribunal had earlier imposed interim nationwide ban on use of glass-coated 'manja' for flying kites, noting that the sharp string poses a danger to humans, animals and birds.
"We hereby direct that in the entire country there shall be prohibition on procuring, stocking, sale and use of nylon thread which is also called Chinese dori or Chinese manja and other synthetic threads coated with glass and such other harmful substances for kite flying," it had said.
PETA had averred that minor children were engaged by the cottage industry for the manufacture of manja which caused respiratory problems as they inhaled harmful substances which were extremely detrimental to their health.
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