Air traffic in Chennai suffered delays today due to smog following the Bhogi festival where old items are burnt, officials said. <br />''<br />''Airport officials said arrival and departure of 10 flights to and from various destinations including Pune and Bengaluru suffered delay of about an hour due to the smog.<br />''<br />''<span style="color: #222222;">Bhogi is celebrated in Tamil Nadu a day ahead of the harvest festival of 'Pongal'. The Tamil Nadu Pollution Control Board has been carrying out awareness campaigns for a 'smoke-free' Bhogi and has been particularly warning against burning plastic material and tyres.</span><br />