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Order of the National Green Tribunal in the matter of R. Radhakrishnan Vs The District Collector, Ariyalur District dated 26/08/2019 regarding limestone mining. The Tribunal expressed its disappointment with the report forwarded by the District Collector and pointed out the inadequacies for instance, it was not mentioned as to whether any air pollution controlling mechanism has been installed and whether the conditions of EC/Consent to Operate/Consent to Establish and mining lease have been complied with.