According to Central Pollution Control Board data (CPCB), the national capital Delhi is the most contaminated sites along with Odisha and Uttar Pradesh. The study finds that there are 112 sites in India contaminated by toxic and hazardous substances. Besides, there are 168 sites that may be contaminated but require investigation and confirmation by CPCB.
Bhalswa and Ghazipur landfill sites, industrial areas at Jhilmil, Wazirpur, New Friends Colony, Dilshad Garden and Lawrence Road are among the 11 contaminated sites in Delhi.
According to the Union Environment Ministry, 'Contaminated Sites' are demarcated areas which constituents the lethal and hazardous substances, caused by humans, exist at levels and in conditions which pose existing or imminent threats to human health and the environment. It includes production areas, landfills, dumps, waste storage and treatment sites, mine tailings sites, spill sites, chemical waste handler and storage sites located in various land uses. 'Probably Contaminated Sites' are areas with alleged but not scientifically proven presence of such contaminants or substances.
The board has also started remediation work to clean up 14 contaminated sites in 7 states on the directions of the National Green Tribunal. These states include Gujarat, Jharkhand, Kerala, Maharashtra, Odisha, Tamil Nadu and Uttar Pradesh.