A layer of haze lingered over the national capital and its suburbs on Thursday morning, with raging farm fires and a fall in the wind speed and temperatures pushing air quality to the worst levels in around a year.
As the skies hung heavy and acrid over the region, people complained of itchy throat and watery eyes.
Experts said unfavourable meteorological conditions -- calm winds and low temperatures -- and smoke from farm fires in neighbouring states led to a dense layer of haze on Wednesday night as the air quality index entered the "severe" zone.
PM10 levels in Delhi-NCR stood at 561 microgram per cubic meter ( g/m3) at 8 am -- the highest since November 15 last year, when it was 637 g/m3, according to CPCB data. PM10 levels below 100 g/m3 are considered safe in India.