Tamil Nadu State Transport Corporation [TNSTC] — Smoke from the silencer

I was travelling from chennai to kanchipuram, bus number tn 21 n 1775, 3pm on 18/07/2016 monday, horrible smoke from the silencer, people driving behind this bus can't even see anything due to this heavy smoke. Pollution control department should take immediate action, i really don't understand how the driver can drive that bus, i kindly request you to take immediate action...