Chennai residents woke up to a hazy sky on Monday (November 13), a day after the Deepavali festival, as the air quality deteriorated to ‘poor’.
As per the Central Pollution Control Board’s (CPCB) real-time air quality monitoring data, the overall air quality index (AQI) of Chennai was 256 as of the early hours of Monday. This puts the city in the same category as Delhi, which had an AQI of 294.
According to the National Air Monitoring Programme’s AQI scale, the air quality check between 0 and 50 is ‘good’, 51 and 100 ‘satisfactory’, 101 and 200 ‘moderate’, 201 and 300 ‘poor’, 301 and 400 ‘very poor’, and 401 and 450 ‘severe’.
