Chennai South Indian cities have swept majority of the top-ten slots on the Livability Index 2011, compiled by the Institute for Competitiveness, an international think-tank.
While Chennai, the most densely populated city in India, ranked fifth on the index, Hyderabad was at number four. Following the 'big brother' cities were Kochi and Kozhikode. Coimbatore, the emerging tier-II city of Tamil Nadu ranked 10th, while the Union territory of Puducherry ranked 11th.