India, Nov. 4 -- Delhi's pollution levels continued to surge on Wednesday morning, with 21 of the 59 monitoring stations recording air quality in the 'severe' category.

The Air Quality Index (AQI) stood at 373 at 7:05 am, in the 'very poor' category, compared with Tuesday's 24-hour average of 350. Tuesday's reading was the worst in 287 days.

At 54 of the 59 monitoring stations, PM2.5 was the primary pollutant. Punjabi Bagh recorded the highest AQI at 452, followed by Jahangirpuri (450) and IIT Delhi (446). Five stations were in the 'poor' category and the remaining 23 in the very poor category.

The Central Pollution Control Board (CPCB) classifies an AQI of 0-50 as 'good', 51-100 as 'satisfactory', 101-200 as 'moderate', 201-300 as 'po...