Delhi's air quality remained severe for the fourth consecutive day today, even as authorities expressed hope that the condition would improve with strong winds expected to clear the stagnant air. The PM10 level (presence of particles with diameter less than 10 mm) was recorded at 754 in Delhi-NCR and 801 in Delhi, leading to hazy conditions.

The PM2.5 level (presence of particles with diameter less than 2.5 mm) that deteriorated from 'very poor' to 'severe' showed improvement today at 184 in Delhi region and 175 in Delhi NCR, said the Central Pollution Control Board (CPCB) data. Yesterday, the PM 2.5 level in Delhi-NCR was at 268 and Delhi at 277.