CHENNAI: The Tamil Nadu Pollution Control Board (TNPCB) has reported that air and noise pollution levels across the State exceeded national standards during this year’s Deepavali, with Chennai’s air quality readings falling to ‘poor’ to ‘very poor’ levels.

According to the official survey report, the highest Air Quality Index (AQI) in the city was recorded at Valasaravakkam – 332 (very poor), while Besant Nagar posted the lowest at 190 (moderate). Other locations including Perungudi (297), Kodungaiyur (312) and Velachery (275) also remained in the ‘poor’ to ‘very poor’ categories.

According to the National Air Monitoring Programme’s AQI scale, air quality is categorised as follows: 0 to 50 is ‘good,’ 51 to 100 is ‘satisfactory,’ 101 to 200 is ‘moderate,’ 201 to 300 is ‘poor,’ 301 to 400

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