Bhopal, Dec 1 (ANI): Social activists demanded immediate scientific assessment of environmental pollution caused by the Bhopal gas tragedy three decades back. Social activist Satinath Sarangi said that a scientific assessment of air, water and ground quality should be done to address the situation. Sarangi added that the waste should be removed and disposed of away from the area, and feel that authorities, who now own the site, have fumbled on taking action. Sarangi even demanded an apology from the government of America and extradition of John Macdonald, secretary of Union Carbide.