Chennai has decontamination.
 Chennai is one of the few cities in the world to accommodate a national park, the Guindy National Park, within its limits
 In 2011, the jurisdiction of the Chennai Corporation was expanded from  174 km2 (67 sq mi) to an area of  426 km2 (164 sq mi), dividing into three regionsNorth, South and Central, which covers 200 wards

