At least ten Chennai-bound flights were diverted and an equal number of flights taking off from the city have been delayed. Flight operations have resumed. A senior officer at the airport said earlier this morning, "The visibility has dipped to 50 metres and since 3:30 am we have no flight activity."
Bonfires made using mats, paper, clothes and cardboard boxes dotted the streets of Chennai from as early as four in the morning. T Saravanan, whose family set fire to their old household items in front of their home in Thiruvanmiyur area and danced to drumbeats said 'Bhogi' is an important part of the Tamil culture. "We know it pollutes the air so we avoid (burning) plastics and tyre," he said.

Pongal 2018: People set bonfires on Chennai streets from as early as 4 am.
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Over the last ten years, the pollution control board in Tamil Nadu has been raising awareness ahead of Pongal, asking people and children in particular to stop burning materials. They also award youngsters who spread the message. A senior officer said, "Bhogi is still a challenge as it's seen as part of a festival. We've brought down burning of tyres and plastics but a lot of awareness still need to be raised."Bharat Jain, whose flight to Mumbai has been delayed said, "It's in a mess. I have an important business meet in Mumbai. All would get off track."