Environmental Science and Technology ICEST 201 2 Chennai, India . March 10-11, 2012 www.icest.org About Chennai From Wikipedia, the free encyclopedia , http://en.wikipedia.org/wiki/Chennai Chennai ( Tamil : சென்னை IPA:  [ˈtʃɛnnəɪ] ), formerly known as Madras, is the capital city of the Indian state of Tamil Nadu . Chennai is the fourth