India, Dec. 12 -- After two days' reprieve, Delhi's air quality again slipped to 'very poor' with a 24-hour average AQI of 307.

Of the 40 monitoring stations in the city, 25 recorded air in the 'very poor' band, with Rohini reporting the worst air at 372 on the CPCB's Sameer app.

According to the Decision Support System for Delhi's Air Quality Management, transport was the biggest contributor at 16.6 per cent, followed by Delhi and peripheral industries at 8.3 per cent, construction at 2.2 per cent, and residential sources at 4 per cent.

In the NCR, Jhajjar contributed 18 per cent to the city's pollution load, Rohtak 5.8 per cent, Sonipat 2.7 per cent, Bhiwani 3.9 per cent, and Gurgaon 1.9 per cent.

In the morning, the capital recorde...